Documentation: kunit: Rename references to kunit_abort()

The kunit_abort() function has been renamed __kunit_abort(), update the
references to it in the documentation.

Suggested-by: Daniel Latypov <[e-mail]>
Signed-off-by: David Gow <[e-mail]>
Reviewed-by: Daniel Latypov <[e-mail]>
Signed-off-by: Shuah Khan <[e-mail]>

Documentation/dev-tools/kunit/architecture.rst

···
 	  terminated immediately.
 
 		- Assertions call the function:
-		  ``void __noreturn kunit_abort(struct kunit *)``.
+		  ``void __noreturn __kunit_abort(struct kunit *)``.
 
-		- ``kunit_abort`` calls the function:
+		- ``__kunit_abort`` calls the function:
 		  ``void __noreturn kunit_try_catch_throw(struct kunit_try_catch *try_catch)``.
 
 		- ``kunit_try_catch_throw`` calls the function: