[bwana plugin] Change function name

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

plugins/bwana/README.md

@@ -7,3 +7,9 @@ To use it add bwana to the plugins array in your zshrc file.
 ```bash
 plugins=(... bwana)
 ```
+
+## Functions
+
+| Function | Description                              |
+| -------- | ---------------------------------------- |
+| `bwana`  | Works just like `man` |

plugins/bwana/bwana.plugin.zsh

@@ -4,7 +4,7 @@
 if [[ -e /Applications/Bwana.app ]] ||
     ( system_profiler -detailLevel mini SPApplicationsDataType | grep -q Bwana )
 then
-  function man() {
+  function bwana() {
     open "man:$1"
   }
 else