Add override annotations - remove warnings

idea/src/org/jetbrains/jet/plugin/JetPairMatcher.java

@@ -35,10 +35,12 @@ public class JetPairMatcher implements PairedBraceMatcher {
             new BracePair(JetTokens.LBRACKET, JetTokens.RBRACKET, false)
     };
 
+    @Override
     public BracePair[] getPairs() {
         return pairs;
     }
 
+    @Override
     public boolean isPairedBracesAllowedBeforeType(@NotNull final IElementType lbraceType, @Nullable final IElementType contextType) {
         return JetTokens.WHITE_SPACE_OR_COMMENT_BIT_SET.contains(contextType)
                 || contextType == JetTokens.SEMICOLON
@@ -49,6 +51,7 @@ public class JetPairMatcher implements PairedBraceMatcher {
                 || contextType == JetTokens.LBRACE;
     }
 
+    @Override
     public int getCodeConstructStart(final PsiFile file, final int openingBraceOffset) {
         return openingBraceOffset;
     }