Correct misspelled English words in comments and printed messages in Bazel's src/... directory (and run fix)

RELNOTES: None.
PiperOrigin-RevId: 222473871
diff --git a/src/test/java/com/google/devtools/build/lib/runtime/BuildEventStreamerTest.java b/src/test/java/com/google/devtools/build/lib/runtime/BuildEventStreamerTest.java
index ef62137..9d054f7 100644
--- a/src/test/java/com/google/devtools/build/lib/runtime/BuildEventStreamerTest.java
+++ b/src/test/java/com/google/devtools/build/lib/runtime/BuildEventStreamerTest.java
@@ -752,7 +752,7 @@
   public void testEarlyFlushBadInitialEvent() throws Exception {
     // Verify that an early flush works correctly with an unusual start event.
     // In this case, we expect 3 events in the stream, in that order:
-    // - an artifical progress event as initial event, to properly link in
+    // - an artificial progress event as initial event, to properly link in
     //   all events
     // - the unusal first event we have seen, and
     // - a progress event reporting the flushed messages.