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/DB/src/main/java/db/DBHandle.java

@@ -1233,7 +1233,7 @@ public class DBHandle {
 
 	/**
 	 * Returns size of buffers utilized within the underlying
-	 * buffer file.  This may be larger than than the requested 
+	 * buffer file.  This may be larger than the requested 
 	 * buffer size.  This value may be used to instatiate a 
 	 * new BufferFile which is compatible with this database
 	 * when using the saveAs method.

Ghidra/Framework/DB/src/main/java/db/Transaction.java

@@ -32,7 +32,7 @@ package db;
  * </pre>
  * 
  * <p>
- * Can be expressed using an an {@link Transaction} instead:
+ * Can be expressed using a {@link Transaction} instead:
  * 
  * <pre>
  * try (Transaction tx = dbHandle.openTransaction(dbErrorHandler)) {