Add Viewing Man Pages with man.vim as a vim til.

vim/viewing-man-pages-with-man-vim.md

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+# Viewing Man Pages with man.vim
+
+In [Quick Man Pages](vim/quick-man-pages.md), I introduced `K` which shells
+out to the man page for the unix command under the cursor. It gets better
+though. Vim has a built-in plugin, `man.vim`, that you can enable which
+allows you to view man pages without shelling out.
+
+Add the following to your `.vimrc` file
+
+```vimscript
+runtime! ftplugin/man.vim
+" grep
+```
+
+Then save it and re-source the configuration with `:source %`.
+
+With the `man.vim` plugin enabled, you can now move your cursor over the
+word `grep` and hit `<leader>K` which will pop open the man page for `grep`
+in a unnamed, split buffer.
+
+Not only does this prevent context-switching when viewing a man page, but it
+also gives you the full power of vim over the content of the man page. You
+can search, you can yank text, or you can even pop open the man page for
+another command.