Make wording more precise

Resetting the inflater/deflater is never a "must". Only _not_ resetting
the inflater is a "must" if the deflater is not being reset.

Author: robert-s-ubi

src/main/java/org/java_websocket/extensions/permessage_deflate/PerMessageDeflateExtension.java

@@ -182,7 +182,7 @@ We can check the getRemaining() method to see whether the data we supplied has b
 
       if (inputFrame.isFin()) {
         decompress(TAIL_BYTES, output);
-        // If context takeover is disabled for the other side, inflater must be reset.
+        // If context takeover is disabled on the other end, inflater can be reset.
         if (resetInflater) {
           inflater.reset();
         }
@@ -252,7 +252,7 @@ public void encodeFrame(Framedata inputFrame) {
       if (endsWithTail(outputBytes)) {
         outputLength -= TAIL_BYTES.length;
       }
-      // If context takeover is disabled for this side, deflater must be reset.
+      // If context takeover is disabled on this end, deflater can be reset.
       if (resetDeflater) {
         deflater.reset();
       }