Rollup merge of rust-lang#103039 - RalfJung:checktools, r=Dylan-DPC

checktools: fix comments

This bothers me each time I see it, time to fix it. ;)
r? ``@Mark-Simulacrum``

src/ci/docker/host-x86_64/x86_64-gnu-tools/checktools.sh

@@ -4,7 +4,7 @@ set -eu
 
 X_PY="$1"
 
-# Try to test all the tools and store the build/test success in the TOOLSTATE_FILE
+# Try to test the toolstate-tracked tools and store the build/test success in the TOOLSTATE_FILE.
 
 set +e
 python3 "$X_PY" test --stage 2 --no-fail-fast \
@@ -19,6 +19,8 @@ set -e
 
 # debugging: print out the saved toolstates
 cat /tmp/toolstate/toolstates.json
+
+# Test remaining tools that must pass.
 python3 "$X_PY" test --stage 2 check-tools
 python3 "$X_PY" test --stage 2 src/tools/clippy
 python3 "$X_PY" test --stage 2 src/tools/rustfmt