Fix markdown lint issues in the upgrade guide

Wrap long lines, fix table alignment, use reference-style link
for the tree-sitter grammar URL.

Author: bbatsov

README.md

@@ -128,47 +128,64 @@ The [super-save](https://github.com/bbatsov/super-save) package also used to be
 
 ## Upgrading to Prelude 2.0
 
-Prelude 2.0 is a major release that modernizes the entire distribution around Emacs 29+ features. Here's what you need to know:
+Prelude 2.0 is a major release that modernizes the entire
+distribution around Emacs 29+ features. Here's what you need to know:
 
 ### Emacs 29.1 is now required
 
-Prelude no longer supports Emacs 28 or older. If you haven't upgraded yet, now's the time. Emacs 29 brings built-in tree-sitter, Eglot (LSP client), `use-package`, and many other improvements that Prelude 2.0 takes full advantage of.
+Prelude no longer supports Emacs 28 or older. If you haven't
+upgraded yet, now's the time. Emacs 29 brings built-in tree-sitter,
+Eglot (LSP client), `use-package`, and many other improvements that
+Prelude 2.0 takes full advantage of.
 
 ### Tree-sitter support
 
-For built-in modes that ship both classic and tree-sitter variants (e.g., `python-mode` / `python-ts-mode`), Prelude automatically selects the tree-sitter version when a grammar is available and falls back to the classic mode when it isn't. Some modules use tree-sitter modes unconditionally (e.g., `prelude-ocaml` uses `neocaml` which is tree-sitter-only), though such modes typically auto-install their grammars.
+For built-in modes that ship both classic and tree-sitter variants
+(e.g., `python-mode` / `python-ts-mode`), Prelude automatically
+selects the tree-sitter version when a grammar is available and falls
+back to the classic mode when it isn't. Some modules use tree-sitter
+modes unconditionally (e.g., `prelude-ocaml` uses `neocaml` which is
+tree-sitter-only), though such modes typically auto-install their
+grammars.
 
-To install tree-sitter grammars, use `M-x treesit-install-language-grammar`. See the [Emacs manual](https://www.gnu.org/software/emacs/manual/html_node/emacs/Language-Grammar.html) for details.
+To install tree-sitter grammars, use
+`M-x treesit-install-language-grammar`. See the
+[Emacs manual][ts-grammar] for details.
+
+[ts-grammar]: https://www.gnu.org/software/emacs/manual/html_node/emacs/Language-Grammar.html
 
 ### Built-in LSP via Eglot
 
-Prelude 2.0 adds LSP support to most language modules using Eglot (built-in since Emacs 29) as the default client. If you were previously using `prelude-lsp` with lsp-mode, note that:
+Prelude 2.0 adds LSP support to most language modules using Eglot
+(built-in since Emacs 29) as the default client. If you were
+previously using `prelude-lsp` with lsp-mode, note that:
 
 - The module has been renamed to `prelude-lsp-mode`.
-- Set `(setq prelude-lsp-client 'lsp-mode)` in your personal config to keep using lsp-mode.
+- Set `(setq prelude-lsp-client 'lsp-mode)` in your personal
+  config to keep using lsp-mode.
 - The default is now Eglot -- no extra packages needed.
 - Eglot keybindings live under `C-c C-l` (rename, code actions, format, etc.).
 
 ### Removed packages and modules
 
 Several outdated packages have been replaced by built-in alternatives:
 
-| Removed | Replacement |
-|---------|-------------|
-| `nlinum` | Built-in `display-line-numbers-mode` |
-| `anzu` | Built-in `isearch-lazy-count` |
-| `epl` | Built-in `package-upgrade-all` / `package-upgrade` |
-| `smex` (binding) | `execute-extended-command` |
-| `anaconda-mode` | LSP (Eglot/lsp-mode) |
-| `js2-mode` | `js-ts-mode` + LSP |
-| `tide` | `typescript-ts-mode` + LSP |
-| `alchemist` | LSP |
-| `go-projectile` | Removed (unmaintained) |
-| `prelude-selectrum` | Use `prelude-vertico` instead |
+| Removed             | Replacement                          |
+|---------------------|--------------------------------------|
+| `nlinum`            | Built-in `display-line-numbers-mode` |
+| `anzu`              | Built-in `isearch-lazy-count`        |
+| `epl`               | Built-in `package-upgrade-all`       |
+| `smex` (binding)    | `execute-extended-command`           |
+| `anaconda-mode`     | LSP (Eglot/lsp-mode)                 |
+| `js2-mode`          | `js-ts-mode` + LSP                   |
+| `tide`              | `typescript-ts-mode` + LSP           |
+| `alchemist`         | LSP                                  |
+| `go-projectile`     | Removed (unmaintained)               |
+| `prelude-selectrum` | Use `prelude-vertico` instead        |
 
 ### Keybinding changes
 
-- `C-x p` no longer opens `proced` (this prefix is now reserved for `project.el`).
+- `C-x p` no longer opens `proced` (reserved for `project.el`).
 - `C-x C-m` runs `execute-extended-command` instead of `smex`.
 - `C-c c` is bound to `org-capture`.
 - `C-c C-l` prefix is used for Eglot commands in programming modes.
@@ -177,9 +194,14 @@ Several outdated packages have been replaced by built-in alternatives:
 
 1. **Update Emacs** to 29.1 or newer.
 2. **Pull the latest Prelude** and restart Emacs. Packages will be updated automatically.
-3. **Review your `prelude-modules.el`** -- if you had `prelude-lsp` enabled, rename it to `prelude-lsp-mode`. If you want Eglot (recommended), you don't need any LSP module enabled.
-4. **Install tree-sitter grammars** for your languages of choice (optional but recommended).
-5. **Check your personal config** for references to removed packages (`nlinum`, `anzu`, `epl`, `anaconda-mode`, `js2-mode`, `tide`, `alchemist`).
+3. **Review your `prelude-modules.el`** -- if you had `prelude-lsp`
+   enabled, rename it to `prelude-lsp-mode`. If you want Eglot
+   (recommended), you don't need any LSP module enabled.
+4. **Install tree-sitter grammars** for your languages of choice
+   (optional but recommended).
+5. **Check your personal config** for references to removed packages
+   (`nlinum`, `anzu`, `epl`, `anaconda-mode`, `js2-mode`, `tide`,
+   `alchemist`).
 
 ## Known issues