Update URL in documentation comment

src/config.zsh

@@ -5,7 +5,7 @@
 
 # Color to use when highlighting suggestion
 # Uses format of `region_highlight`
-# More info: http://zsh.sourceforge.net/Doc/Release/Zsh-Line-Editor.html#Zle-Widgets
+# More info: https://zsh.sourceforge.io/Doc/Release/Zsh-Line-Editor.html#Zle-Widgets
 (( ! ${+ZSH_AUTOSUGGEST_HIGHLIGHT_STYLE} )) &&
 typeset -g ZSH_AUTOSUGGEST_HIGHLIGHT_STYLE='fg=8'