add missing header end comments

- ensures a consistent usage in header files
- also add a blank line after the copyright header where missing
- also remove orphan new-lines at the end of some files

src/bloom.h

@@ -91,4 +91,4 @@ public:
     void UpdateEmptyFull();
 };
 
-#endif /* BITCOIN_BLOOM_H */
+#endif // BITCOIN_BLOOM_H