Fix typo in JDA#isAutoReconnect javadocs

[MrPowerGamerBR]

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Changes

• [ ] Internal code
• [ ] Library interface (affecting end-user code)
• [X] Documentation
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Closes Issue: NaN

Description

Fix typo in JDA#isAutoReconnect javadocs that I found when reading JDA's sopurce code... Previously it was USed so I fixed it to Used, yeah, that's it.