docs: updated nvim-lspconfig link

This PR updates the link of nvim-lspconfig doc for gopls.

Change-Id: I9f64ca9c310af8a6c6392245c88eea666edf4657
GitHub-Last-Rev: 9774e50
GitHub-Pull-Request: #351
Reviewed-on: https://go-review.googlesource.com/c/tools/+/367254
Reviewed-by: Robert Findley <[email protected]>
Trust: Robert Findley <[email protected]>
Trust: Hyang-Ah Hana Kim <[email protected]>
Run-TryBot: Hyang-Ah Hana Kim <[email protected]>
gopls-CI: kokoro <[email protected]>
TryBot-Result: Gopher Robot <[email protected]>

Author: akkisagiraju

gopls/doc/vim.md

@@ -225,5 +225,5 @@ autocmd FileType go setlocal omnifunc=v:lua.vim.lsp.omnifunc
 [govim-install]: https://github.com/myitcv/govim/blob/master/README.md#govim---go-development-plugin-for-vim8
 [nvim-docs]: https://neovim.io/doc/user/lsp.html
 [nvim-install]: https://github.com/neovim/neovim/wiki/Installing-Neovim
-[nvim-lspconfig]: https://github.com/neovim/nvim-lspconfig/blob/master/CONFIG.md#gopls
+[nvim-lspconfig]: https://github.com/neovim/nvim-lspconfig/blob/master/doc/server_configurations.md#gopls
 [nvim-lspconfig-imports]: https://github.com/neovim/nvim-lspconfig/issues/115