Documentation: Fix incorrect paths in fuzz_testing.md and yaml.md (#36689)

* Documentation: Fix incorrect paths in fuzz_testing.md and yaml.md

* Update fuzz_testing.md

Author: BoB13-Matter

docs/testing/fuzz_testing.md

@@ -79,10 +79,10 @@ for an example of a simple fuzz test.
     -   Another example:
         [src/setup_payload/tests/BUILD.gn](https://github.com/project-chip/connectedhomeip/blob/b367512f519e5e109346e81a0d84fd85cd9192f7/src/setup_payload/tests/BUILD.gn#L43)
 
--   Add to `src/BUILD.gn`
+-   Add to `${chip_root}/BUILD.gn`
 
     -   Add the Fuzzing Target in this part of the code :
-        [src/BUILD.gn](https://github.com/project-chip/connectedhomeip/blob/b367512f519e5e109346e81a0d84fd85cd9192f7/BUILD.gn#L52)
+        [\${chip_root}/BUILD.gn](https://github.com/project-chip/connectedhomeip/blob/b367512f519e5e109346e81a0d84fd85cd9192f7/BUILD.gn#L52)
 
     -   Add Fuzzing Target like that
 

docs/testing/yaml.md

@@ -330,12 +330,11 @@ or
 bootstrap.sh should be used for for the first setup, activate.sh may be used for
 subsequent setups as it is faster.
 
-Next build the python wheels and create a venv (called `py` here, but any name
-may be used)
+Next build the python wheels and create a venv
 
 ```
 ./scripts/build_python.sh -i out/python_env
-source py/bin/activate
+source out/python_env/bin/activate
 ```
 
 Compile chip-tool: