pw_build: Remove deprecated pw_python_script

pw_python_script was renamed to pw_python_action.

Change-Id: I67700efe1385555c6386ee5db7c0f9b50fcf7c43
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/22300
Reviewed-by: Alexei Frolov <frolv@google.com>
Commit-Queue: Wyatt Hepler <hepler@google.com>
diff --git a/pw_build/docs.rst b/pw_build/docs.rst
index 8fe235b..d1504b4 100644
--- a/pw_build/docs.rst
+++ b/pw_build/docs.rst
@@ -103,7 +103,7 @@
     public = [ "public/pw_foo/foo.h" ]
   }
 
-.. _module-pw_build-python-script:
+.. _module-pw_build-python-action:
 
 pw_python_action
 ^^^^^^^^^^^^^^^^