chore(release): update Trusted Publishing checklist Repository field

PR #2 review surfaced two `Repository: python-docs-mcp-server` references in
the PyPI Trusted Publishing setup checklists (RELEASE.md lines 11 and 99).
These refer to the GitHub repo name used for OIDC token issuance — must
match the post-rename `python-stdlib-mcp` or Trusted Publishing will fail
at v0.1.5 tag time.

PyPI project name (line 9 and 97) stays `python-docs-mcp-server` —
the PyPI package name is unchanged.

Author: ayhammouda

.github/RELEASE.md

@@ -8,7 +8,7 @@ Before the first release, configure PyPI Trusted Publishing:
 2. Add a new pending publisher:
    - **PyPI project name**: `python-docs-mcp-server`
    - **Owner**: your GitHub username or org
-   - **Repository**: `python-docs-mcp-server`
+   - **Repository**: `python-stdlib-mcp`
    - **Workflow name**: `release.yml`
    - **Environment name**: `pypi`
 3. In the GitHub repo, go to Settings > Environments
@@ -96,7 +96,7 @@ Complete these steps in order. Each step has a checkbox -- do not skip ahead.
 - [ ] PyPI pending publisher configured at https://pypi.org/manage/account/publishing/:
   - PyPI project name: `python-docs-mcp-server`
   - Owner: `<your-github-username>`
-  - Repository: `python-docs-mcp-server`
+  - Repository: `python-stdlib-mcp`
   - Workflow name: `release.yml`
   - Environment name: `pypi`
 - [ ] GitHub environment `pypi` created in repo Settings > Environments