[DOC] Fix syntax errors, typos, formatting; increase consistency (#1357)

This PR;
- Fixes syntax errors like `.type values: dict[str,
Callable[[list[Any]], Any]]` to `:type values: dict[str,
Callable[[list[Any]], Any]]`,
- Fixes typos,
- Fixes formatting like `k ++` to ` k++`,
- Increases consistency (e.g. by transforming the minority `cd dir/` to
the majority `cd dir`).

docs/python-api/triton.testing.rst

@@ -1,5 +1,5 @@
 triton.testing
-================
+==============
 
 .. currentmodule:: triton.testing
 
@@ -9,4 +9,4 @@ triton.testing
 
     do_bench
     Benchmark
-    perf_report
+    perf_report