Fix a title in the history-substring-search README

modules/history-substring-search/README.md

@@ -1,10 +1,10 @@
 History Substring Search
 ========================
 
-Integrates [zsh-syntax-highlighting][1] into Oh My Zsh, which implements the
-[Fish shell][2]'s history search feature, where the user can type in any part
-of a previously entered command and press the `UP` and `DOWN` arrow keys to
-cycle through matching commands.
+Integrates [zsh-history-substring-search][1] into Oh My Zsh, which implements
+the [Fish shell][2]'s history search feature, where the user can type in any
+part of a previously entered command and press the `UP` and `DOWN` arrow keys
+to cycle through matching commands.
 
 If this module is used in conjuncture with the *syntax-highlighting* module, it
 must be loaded **after** it.