Update README for diff_commit_line

Signed-off-by: Aaron Hallaert <[email protected]>

Author: aaronhallaert

README.md

@@ -79,9 +79,18 @@ selected lines
 
 _Grep behaviour_: filter on commit message.
 
-Note: First you have to select the lines in visual mode, then go back to normal
+#### How to use
+
+_The following only applies when you use one of the commands below._
+
+```vim
+:Telescope advanced_git_search diff_commit_line
+:lua require('telescope').extensions.advanced_git_search.diff_commit_line()
+```
+
+First you have to select the lines in visual mode, then go back to normal
 mode and execute this command.
-To make this a bit easier, you can wrap it in a user command and define a keybind:
+To make a bit easier, you can wrap it in a user command and define a keybind:
 
 ```lua
 vim.api.nvim_create_user_command(
@@ -98,6 +107,8 @@ vim.api.nvim_set_keymap(
 )
 ```
 
+No extra setup is needed when you use `:AdvancedGitSearch`.
+
 #### _Keymaps_
 
 - `<CR>` opens a diff for the current file with the corresponding file on the selected commit