Many typo's

These were found using the command below searching for duplicated words,
and manually going through the results to remove the false positives and
reword the true positives. Sometimes I removed the doubled word and
sometimes I replaced the duplicated word.

The grep command:
grep -nIEr '\b([a-zA-Z]+)[[:space:]*]+\1\b' ./Ghidra

Ghidra/Framework/Gui/src/main/java/resources/MultiIcon.java

@@ -25,7 +25,7 @@ import generic.theme.GIcon;
 import ghidra.util.ColorUtils;
 
 /**
- * Icon class for for displaying overlapping icons.  Icons are drawn in the order they
+ * Icon class for displaying overlapping icons.  Icons are drawn in the order they
  * are added.
  */
 public class MultiIcon implements Icon {