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/Features/ProgramDiff/src/main/help/help/topics/Diff/Diff.htm

@@ -1156,7 +1156,7 @@
                 <td align="left" valign="top" width="100">
                   (Only available for Labels.) Merges labels from the second 
                   program into the tool's program for the selected code units 
-                  in the the Diff and set the primary labels as in the second 
+                  in the Diff and set the primary labels as in the second 
                   program, if possible.<br>
                 </td>
               </tr>

Ghidra/Features/ProgramDiff/src/main/java/ghidra/app/plugin/core/diff/DiffController.java

@@ -217,7 +217,7 @@ public class DiffController {
 
 	/**
 	 * Ignore any differences in the specified address set.
-	 * @param p1AddressSet address set set of differences
+	 * @param p1AddressSet address set of differences
 	 * The addresses in this set should be derived from the p1 program.
 	 */
 	void ignore(AddressSetView p1AddressSet, TaskMonitor monitor) {