Update the documentation around opting out of an individual hook function (#864)

Author: tabrisnet

docs/Developer-Guide_Extensions-Hooks.md

@@ -5,7 +5,7 @@
 ## Hooks
 
 - Hooks are listed in the order they are called.
-- Individual/specific hook functions can be [skipped/ignored/opted-out](/Developer-Guide_Extensions#opt-out-of-individual-hook-functions).
+- Individual/specific hook functions can be [skipped/ignored/opted-out](/Developer-Guide_Extensions#how-to-opt-out-of-a-specific-hook-function).
 
 ### `post_family_config`
 

docs/Developer-Guide_Extensions.md

@@ -111,7 +111,8 @@ They're the same, except:
 Any function making use of the extension framework [generally of the form `hook_name__individual_function`] can be skipped in a board or family config, by way of
 
 ```bash
-unset -f hook_name__individual_function
+extension_hook_opt_out "hook_name__individual_function"
 ```
 
-Doing so is at the board/family maintainer's own risk and doing so is officially unsupported. Consider splitting the function into pieces so that only the part the board/family cannot tolerate is skipped.
+Doing so is at the board/family maintainer's own risk and is officially unsupported. Consider splitting the function into pieces so that only the part the board/family cannot tolerate is skipped.
+You can also opt out, then copy the otherwise-intolerable function into your own config and modify it as appropriate. Splitting the intolerable-function is still highly recommended.