docs: add docs pages to pytest-examples and fix code examples

- Add docs/quickstart.md and docs/concepts.md to pytest-examples so
  all code blocks in documentation are linted by ruff
- Fix f-string in concepts.md Prompts example that contained backticks
  causing a syntax error when parsed standalone

Author: Kludex

docs/concepts.md

@@ -70,7 +70,7 @@ Prompts are reusable templates for LLM interactions. They help standardize commo
 @mcp.prompt()
 def review_code(code: str, language: str = "python") -> str:
     """Generate a code review prompt."""
-    return f"Review this {language} code:\n\n```{language}\n{code}\n```"
+    return f"Please review the following {language} code:\n\n{code}"
 ```
 
 <!-- TODO: See [Prompts](server/prompts.md) for full documentation. -->

tests/test_examples.py

@@ -97,7 +97,11 @@ async def test_desktop(monkeypatch: pytest.MonkeyPatch):
 
 
 # TODO(v2): Change back to README.md when v2 is released
-@pytest.mark.parametrize("example", find_examples("README.v2.md"), ids=str)
+@pytest.mark.parametrize(
+    "example",
+    find_examples("README.v2.md", "docs/quickstart.md", "docs/concepts.md"),
+    ids=str,
+)
 def test_docs_examples(example: CodeExample, eval_example: EvalExample):
     ruff_ignore: list[str] = ["F841", "I001", "F821"]  # F821: undefined names (snippets lack imports)