Verify spelling fixes pass check-spelling

Author: jsoref

.github/actions/spelling/excludes.txt

@@ -0,0 +1,19 @@
+^\.github/actions/spelling/
+/external/
+/HTMLTextArea\.java$
+/testHeapDumpLog\.txt$
+LICENSE
+\.bin$
+\.dll$
+\.exe$
+\.gif$
+\.icns$
+\.ico$
+\.jar$
+\.jnilib$
+\.ks$
+\.map$
+\.png$
+\.sl$
+\.so$
+\.zip$