Update docs/guides/modules/test/pages/adaptive-testing.adoc

Co-authored-by: Rosie Yohannan <rosie@circleci.com>

Author: mseong6251

docs/guides/modules/test/pages/adaptive-testing.adoc

@@ -806,7 +806,7 @@ Yes! The branch behavior is fully customizable through your CircleCI configurati
 See Scenario 3 in the "Flag Usage Scenarios" section for examples of customizing branch behavior.
 
 [#baseline-coverage]
-=== Why are there so many files impact a test?
+=== Why are there so many files impacting a test?
 
 If you see many files impacting each test during analysis (e.g., "...found 150 files impacting test..."), this may be caused by shared setup code like global imports or framework initialization being included in coverage.