[docs] Fix documentation inconsistencies in developer guides

## Summary

This PR fixes three inconsistencies found in the developer documentation under `doc/`:

### 1. Broken `conftest.py` link in `doc/dev/mgmt/tests.md`

The link pointed to `sdk/advisor/azure-mgmt-advisor/tests/conftest.py`, which does not exist in the repository. The `azure-mgmt-advisor` package uses auto-generated tests, and the conftest lives at `sdk/advisor/azure-mgmt-advisor/generated_tests/conftest.py`.

**Fix:** Updated the URL to point to the correct `generated_tests/conftest.py` path.

### 2. Stale line-number anchors in `doc/dev/pylint_checking.md`

The guide linked to specific line numbers in `eng/tools/azure-sdk-tools/azpysdk/pylint.py` to show where the pinned pylint version and the `azure-pylint-guidelines-checker` version are defined. Both anchors were off:

- `#L17` → `#L16` (`PYLINT_VERSION = "4.0.4"`)
- `#L61` → `#L70` (`azure-pylint-guidelines-checker==0.5.7`)

**Fix:** Updated the anchors to match the current line numbers.

### 3. Outdated Python 2 reference in `doc/dev/static_type_checking.md`

A note said type comments are used in "legacy code supporting Python 2". Python 2 support was dropped years ago and no active library in this repo uses comment-style type hints for Python 2 compatibility.

**Fix:** Simplified the note to just say "Use inline annotation style instead."

> Generated by [Documentation Consistency Check](https://github.com/Azure/azure-sdk-for-python/actions/runs/29720083162) · 119.7 AIC · ⌖ 12.4 AIC · ⊞ 5.9K · [◷](https://github.com/search?q=repo%3AAzure%2Fazure-sdk-for-python+%22gh-aw-workflow-id%3A+doc-consistency-check%22&type=pullrequests)

---

> [!NOTE]
> This was originally intended as a pull request, but GitHub Actions is not permitted to create or approve pull requests in this repository.
> The changes have been pushed to branch `doc/fix-inconsistencies-2026-092e77602d1e7e2b`.
>
> **[Click here to create the pull request](https://github.com/Azure/azure-sdk-for-python/compare/main...doc/fix-inconsistencies-2026-092e77602d1e7e2b?expand=1&title=%5Bdocs%5D%20Fix%20documentation%20inconsistencies%20in%20developer%20guides)**

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Show patch preview (65 of 65 lines)

```diff
From a4108fe3f6e7e1fca1575d0c3a3dad3dbae9da64 Mon Sep 17 00:00:00 2001
From: "github-actions[bot]"
Date: Mon, 20 Jul 2026 05:56:10 +0000
Subject: [PATCH] doc: fix inconsistencies in developer documentation

- Fix broken link in doc/dev/mgmt/tests.md: conftest.py example
pointed to sdk/advisor/azure-mgmt-advisor/tests/conftest.py which
does not exist; corrected to generated_tests/conftest.py
- Fix stale line-number anchors in doc/dev/pylint_checking.md:
pylint.py#L17 -> #L16 (PYLINT_VERSION) and #L61 -> #L70
(azure-pylint-guidelines-checker install line)
- Remove outdated Python 2 reference in doc/dev/static_type_checking.md:
the note about type comments being used for Python 2 legacy code is
no longer relevant since Python 2 support was dropped

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
---
doc/dev/mgmt/tests.md | 2 +-
doc/dev/pylint_checking.md | 2 +-
doc/dev/static_type_checking.md | 2 +-
3 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/doc/dev/mgmt/tests.md b/doc/dev/mgmt/tests.md
index 7f7bfdd4..7328a29b 100644
--- a/doc/dev/mgmt/tests.md
+++ b/doc/dev/mgmt/tests.md
@@ -153,7 +153,7 @@ Management plane SDKs are those that are formatted `azure-mgmt-xxxx`, otherwise

### Tips:
After the migration of the test proxy, `conftests.py` needs to be configured under the tests folder.

-* For a sample about `conftest.py`, see [conftest.py](https://github.com/Azure/azure-sdk-for-python/blob/main/sdk/advisor/azure-mgmt-advisor/tests/conftest.py).

+* For a sample about `conftest.py`, see [conftest.py](https://github.com/Azure/azure-sdk-for-python/blob/main/sdk/advisor/azure-mgmt-advisor/generated_tests/conftest.py).

* For more information about test proxy, see [TestProxy][testproxy].

### Example 1: Basic Azure service interaction and recording
diff --git a/doc/dev/pylint_checking.md b/doc/dev/pylint_checking.md
index 7bee34e3..190eedf2
... (truncated)
```

Review doc/dev/mgmt/tests.md, doc/dev/pylint_checking.md, and doc/dev/static_type_checking.md alongside the referenced repository paths and anchors. Verify that the conftest.py link resolves, the pylint links point to the stated definitions, and the type-checking note no longer refers to Python 2; the documentation checks should pass with only these three updates.

Written by the indexing model from the issue text.