[Bugfix][CI/Build] Fix codespell failing to skip files in `git diff` (#5097)

format.sh

@@ -113,8 +113,11 @@ mypy vllm/logging --config-file pyproject.toml
 mypy vllm/model_executor --config-file pyproject.toml
 
 
+# If git diff returns a file that is in the skip list, the file may be checked anyway:
+# https://github.com/codespell-project/codespell/issues/1915
+# Avoiding the "./" prefix and using "/**" globs for directories appears to solve the problem
 CODESPELL_EXCLUDES=(
-    '--skip' '*docs/source/_build/**,./tests/lora/data'
+    '--skip' 'tests/prompts/**,./benchmarks/sonnet.txt,tests/lora/data/**,build/**'
 )
 
 # check spelling of specified files