Only run docs review workflow on non-forks. (#490)

* Only run docs review workflow on non-forks.

* [pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>

.github/workflows/docs-review.yml

@@ -18,6 +18,8 @@ concurrency:
 
 jobs:
     build:
+        if: >-
+            !github.event.repository.fork
         runs-on: ubuntu-latest
         permissions:
             contents: read