[docs] Fix documentation inconsistencies in doc/ folder

Fixes four verified documentation inconsistencies found by reviewing all markdown files under `doc/` against the current repository structure and source code.

## Changes

### `doc/dev/perfstress_tests.md`
The system-tests install command referenced a `tools/devtools_testutils` path that **does not exist** in the repository. The actual path is `eng/tools/azure-sdk-tools`.

**Before:**
```
pip install -e azure-sdk-for-python/tools/devtools_testutils[systemperf]
```
**After:**
```
pip install -e azure-sdk-for-python/eng/tools/azure-sdk-tools[systemperf]
```

### `doc/dev/conda-builds.md`
The file referenced `eng/conda_env.yml` which **does not exist**. The file lives at `conda/conda-recipes/conda_env.yml`.

### `doc/dev/pylint_checking.md`
The link for `azure-pylint-guidelines-checker` pointed to line `#L61` of `pylint.py`, which is the `register()` method body — unrelated to the version. The `PYLINT_GUIDELINES_CHECKER_VERSION` constant is at line `#L18`.

### `doc/dev/tests.md`
Three reference links for `kv_test_resources` pointed to a SHA-pinned, now-deleted `test-resources.json` file in the Key Vault SDK. That file was replaced by `test-resources.bicep`. Updated all three links to point to the current `test-resources.bicep` file on `main`, with corrected line anchors for the resources section (line 38) and outputs section (line 174).

> Generated by [Documentation Consistency Check](https://github.com/Azure/azure-sdk-for-python/actions/runs/33358307244) · 199.1 AIC · ⌖ 12.6 AIC · ⊞ 5.8K · [◷](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-documentation-inconsistencies-22e1d1be83f5f3d2`.
>
> **[Click here to create the pull request](https://github.com/Azure/azure-sdk-for-python/compare/main...doc/fix-documentation-inconsistencies-22e1d1be83f5f3d2?expand=1&title=%5Bdocs%5D%20Fix%20documentation%20inconsistencies%20in%20doc%2F%20folder)**

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Show patch preview (82 of 82 lines)

```diff
From e0ffa714c6c5f4def2e3b1b9346ce3d302da544e Mon Sep 17 00:00:00 2001
From: "github-actions[bot]"
Date: Mon, 31 Aug 2026 04:55:20 +0000
Subject: [PATCH] doc: fix documentation inconsistencies

- perfstress_tests.md: fix install path from non-existent tools/ to
eng/tools/azure-sdk-tools
- conda-builds.md: fix conda_env.yml path from eng/ to
conda/conda-recipes/
- pylint_checking.md: fix stale line anchor #L61 to #L18 for
PYLINT_GUIDELINES_CHECKER_VERSION
- tests.md: update kv_test_resources links from SHA-pinned deleted
test-resources.json to main-branch test-resources.bicep

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
---
doc/dev/conda-builds.md | 2 +-
doc/dev/perfstress_tests.md | 2 +-
doc/dev/pylint_checking.md | 2 +-
doc/dev/tests.md | 6 +++---
4 files changed, 6 insertions(+), 6 deletions(-)

diff --git a/doc/dev/conda-builds.md b/doc/dev/conda-builds.md
index 72e845ce..085e8b34 100644
--- a/doc/dev/conda-builds.md
+++ b/doc/dev/conda-builds.md
@@ -12,7 +12,7 @@ Follow the instructions [here](https://docs.conda.io/projects/conda-build/en/lat

- Update `CondaArtifacts` parameters as necessary within `eng/pipelines/templates/stages/conda-sdk-client.yml` .
- If necessary, add or update the conda recipes present under `/conda/conda-recipes`.
-- Update `eng/conda_env.yml` variable `AZURESDK_CONDA_VERSION` to the target version you wish to release.
+- Update `conda/conda-recipes/conda_env.yml` variable `AZURESDK_CONDA_VERSION` to the target version you wish to release.
- Invoke [python - conda](https://dev.azure.com/azure-sdk/internal/_build?definitionId=6321) manually, checking off which packages you wish to release.
- Once built, approve the packages for release individually, there will be pending approval stages.

diff --git a/doc/dev/perfstress_tests.md b/doc/dev/perfstress_tests.md
index c0f7fa85..fe3ded40 100644
--- a/doc/dev/perfstress_tests.md
+++ b/doc/
... (truncated)
```

Esamina doc/dev/perfstress_tests.md, doc/dev/conda-builds.md, doc/dev/pylint_checking.md e doc/dev/tests.md confrontandoli con i percorsi del repository e i file sorgente collegati. Verifica ogni percorso referenziato, ogni ancora di versione e ogni collegamento a una risorsa Key Vault, quindi conferma che tutti e quattro i documenti contengano riferimenti aggiornati; il lavoro è già staged sul branch indicato per una pull request.

Scritto dal modello di indicizzazione a partire dal testo della issue.