Simplify explanation of bwana function

plugins/bwana/README.md

@@ -8,8 +8,5 @@ To use it add bwana to the plugins array in your zshrc file.
 plugins=(... bwana)
 ```
 
-## Functions
-
-| Function | Description                              |
-| -------- | ---------------------------------------- |
-| `bwana`  | Works just like `man` |
+The `bwana` function opens the man page of the passed argument in the Bwana app.
+For example: `bwana ln` opens the man page for `ln` in Bwana.