docs: remove unmock func from docs

Author: Chemaclass

docs/test-doubles.md

@@ -41,34 +41,6 @@ EOF
 ```
 :::
 
-## unmock
-
-> `unmock "function"`
-
-Undo the previous overridden behavior of a callable using mock.
-
-::: code-group
-```bash [Example]
-function test_example() {
-  function code() {
-    ps a | grep bash
-  }
-
-  mock ps<<EOF
-PID TTY          TIME CMD
-13525 pts/7    00:00:01 bash
-24162 pts/7    00:00:00 ps
-EOF
-
-  # At this point, ps will return the mocked value above
-  assert_equals "13525 pts/7    00:00:01 bash" "$(code)"
-
-  # From now on, ps will have the original behaviour again
-  unmock ps
-}
-```
-:::
-
 ## spy
 > `spy "function"`