Update PR labels (#6925)

* Update PR labels

Use `topic-documentation` and automatically run benchmarks

* [skip-ci]

* [pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

* [skip-ci] skip whats-new

Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>

Author: dcherian

.github/labeler.yml

@@ -10,10 +10,6 @@ dependencies:
   - requirements.txt
   - ci/requirements/*
 
-documentation:
-  - doc/*
-  - doc/**/*
-
 topic-arrays:
   - xarray/core/duck_array_ops.py
 
@@ -37,6 +33,10 @@ topic-dask:
 topic-DataTree:
   - xarray/core/datatree*
 
+topic-documentation:
+  - ['doc/*', '!doc/whats-new.rst']
+  - doc/**/*
+
 topic-faq:
   - doc/howdoi.rst
 
@@ -54,6 +54,10 @@ topic-indexing:
   - xarray/core/indexes.py
   - xarray/core/indexing.py
 
+run-benchmark:
+  - asv_bench/benchmarks/*
+  - asv_bench/benchmarks/**/*
+
 topic-performance:
   - asv_bench/benchmarks/*
   - asv_bench/benchmarks/**/*