osx/*: update page (#7665)

pages/osx/whence.md

@@ -1,23 +1,24 @@
 # whence
 
 > A zsh builtin to indicate how a given command would be interpreted.
+> More information: <https://www.unix.com/man-page/OpenSolaris/1/whence/>.
 
 - Interpret {{command}}, with expansion if defined as an `alias` (similar to the `command -v` builtin):
 
-`whence {{command}}`
+`whence "{{command}}"`
 
 - Display type of {{command}}, with location if defined as a function, or binary (equivalent to the `type` and `command -V` builtins):
 
-`whence -v {{command}}`
+`whence -v "{{command}}"`
 
 - Same as above, except display content of shell functions instead of location (equivalent to `which` builtin):
 
-`whence -c {{command}}`
+`whence -c "{{command}}"`
 
 - Same as above, but show all occurrences on command path (equivalent to the `where` builtin):
 
-`whence -ca {{command}}`
+`whence -ca "{{command}}"`
 
 - Search only the `PATH` for {{command}}, ignoring builtins, aliases or shell functions (equivalent to the `where` command):
 
-`whence -p {{command}}`
+`whence -p "{{command}}"`