Minor text fixes.

Author: kurtisvg

.kokoro/tests/diff_tests.sh

@@ -42,14 +42,15 @@ echo -e "\n******************** TESTING AFFECTED PROJECTS ********************"
 cd github/java-docs-samples
 find * -name pom.xml -print0 | sort -z | while read -d $'\0' file
 do
-
     # Navigate to project
+    file=$(dirname "$file")
     pushd "$file" > /dev/null
+
     set +e
-    # Has the project changed?
+    # Only tests changed projects
     git diff --quiet master.. .
     CHANGED=$?
-    # Skip parents so the projects aren't tested twice
+    # Only test leafs to prevent testing twice
     PARENT=$(grep "<modules>" pom.xml -c)
     set -e