update doc for MRU

README.md

@@ -378,7 +378,6 @@ alias zc='z -c'      # restrict matches to subdirs of $PWD
 alias zz='z -i'      # cd with interactive selection
 alias zf='z -I'      # use fzf to select in multiple matches
 alias zb='z -b'      # quickly cd to the parent directory
-alias zh='zf -t .'   # cd to MRU.
 ```
 
 Import data from z.sh：