[bwana plugin] Change function name

Fix #5732
Change name function from `man` to `bwana`.

plugins/bwana/bwana.plugin.zsh

@@ -4,10 +4,10 @@
 if [[ -e /Applications/Bwana.app ]] ||
     ( system_profiler -detailLevel mini SPApplicationsDataType | grep -q Bwana )
 then
-  function man() {
+  function bwana() {
     open "man:$1"
   }
 else
-  echo "Bwana lets you read man files in Safari through a man: URI scheme" 
+  echo "Bwana lets you read man files in Safari through a man: URI scheme"
   echo "To use it within Zsh, install it from https://www.bruji.com/bwana/"
 fi