revising note about snippets vs. docc catalogs and target linkage

Author: heckj

Sources/SwiftDocC/Semantics/Snippets/Snippet.swift

@@ -12,10 +12,6 @@ import Foundation
 public import Markdown
 import SymbolKit
 
-// NOTE: If you update the DocC content, remember to run
-// `swift run generate-symbol-graph` to regenerate the DocC
-// symbol content for the DocC Documentation.
-
 /// Embeds a code example from the project's code snippets.
 ///
 /// ```markdown

Sources/docc/DocCDocumentation.docc/adding-code-snippets-to-your-content.md

@@ -62,8 +62,8 @@ YourProject
 etc...
 ```
 
-> Note: Unlike `Snippets`, your Swift package's documentation catalog should be located as a subdirectory of `Sources`, where all of your other Swift source code files are located. For example, see `YourProject.docc` above.
-
+> Note: Snippets are a package-wide resource, and package manager compiles each snippet into its own module.
+> As such, the `Snippets` directory is separate from documentation catalogs, located with each target's source files.
 
 The following example illustrates a code example in the file `Snippets/example-snippet.swift`: