docs: minor fixes

Author: chrisgrieser

README.md

@@ -371,7 +371,7 @@ require("tinygit").fileHistory()
 ```
 
 The type of history search depends on the mode `.fileHistory` is called from:
-- **Normal mode**: search history for a string (`git log -G`)
+- **Normal mode**: search file history for a string (`git log -G`)
 	* Correctly follows file renamings, and displays past filenames in the
 	  commit selection.
 	* The search input is case-insensitive and supports regex.
@@ -392,13 +392,6 @@ The type of history search depends on the mode `.fileHistory` is called from:
 Note that visual mode detection requires you to use the lua function above
 instead of the `:Tinygit` ex-command.
 
-**Keymaps in the diff popup**
-- `<Tab>`: show older commit
-- `<S-Tab>`: show newer commit
-- `yh`: yank the commit hash to the system clipboard
-- `R`: restore file to state at commit
-- `n`/`N`: go to the next/previous occurrence of the query (only file history)
-
 ### Stash
 Simple wrappers around `git stash push` and `git stash pop`.