git-escape-magic: fix typo (#8113)

plugins/git-escape-magic/README.md

@@ -8,10 +8,9 @@ An excerpt from that project's readme explains it's purpose.
 
 > It eliminates the need for manually escaping those meta-characters. The zle function it provides is context aware and recognizes the characteristics of each subcommand of git. Every time you type one of these meta-characters on a git command line, it automatically escapes the meta-character with a backslash as necessary and as appropriate.
 
-## Useage
+## Usage
 
 To use this plugin add it to your list of plugins in your `.zshrc` file.
 
 **NOTE**: If you use url-quote-magic it must be included before this
 plugin runs to prevent any conflicts.
-