Remove ableist language from web test documentation

Change-Id: I96353308a3c6c4c62c390fdc36e29dadf58b4ea3
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6337722
Commit-Queue: Michael Ludwig <[email protected]>
Auto-Submit: Kaylee Lubick <[email protected]>
Reviewed-by: Michael Ludwig <[email protected]>
Cr-Commit-Position: refs/heads/main@{#1430451}
diff --git a/docs/testing/writing_web_tests.md b/docs/testing/writing_web_tests.md
index d285a19..a541412f 100644
--- a/docs/testing/writing_web_tests.md
+++ b/docs/testing/writing_web_tests.md
@@ -308,7 +308,7 @@
 Because of [baseline fallback](./web_test_baseline_fallback.md), it may not be
 possible to [represent a platform-specific all-`PASS`
 status](https://crbug.com/1324638) by the platform baseline's absence. In such
-rare cases, `blink_tool.py rebaseline-cl` will generate a dummy baseline
+rare cases, `blink_tool.py rebaseline-cl` will generate a placeholder baseline
 indicating to `run_web_tests.py` that all subtests are meant to pass:
 
 ```
@@ -318,7 +318,7 @@
 Harness: the test ran to completion.
 ```
 
-`blink_tool.py optimize-baselines` will automatically remove these dummy
+`blink_tool.py optimize-baselines` will automatically remove these placeholder
 baselines once all platforms are all-`PASS`.
 ***