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LUCENE-4881: javadocs for SentinelIntSet

BUG - FEATURE: <type-ID>

This is a behavior modifier commit: this change set is composed of command and non-void-command methods, and these methods execute complex internal behavioral changes within an object. This change set is mainly composed of:

1. Changes to package org.apache.lucene.util:

1.1. Modifications to SentinelIntSet.java:

1.1.1. Modify javadoc at SentinelIntSet class

1.1.2. Add javadoc at hash(int) method

1.1.3. Add javadoc at exists(int) method

1.1.4. Add javadoc at rehashCount : int field

1.1.5. Add javadoc at put(int) method

1.1.6. Add javadoc at keys : int[] field

1.1.7. Add javadoc at size() method

1.1.8. Add foreach statement at rehash() method

1.1.9. Remove variable declaration to key at rehash() method

1.1.10. Remove for loop with (i < oldKeys.length) condition at rehash() method

1.1.11. Add javadoc at rehash() method