api: remove _t suffix from x265_param in comments

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extra : rebase_source : 0676c9fd4a434ebd8e32329f845041be26afcf5f
api: remove mention of x265_encoder_reconfig(), which doesn't yet exist

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extra : rebase_source : f63952ce127a2db00d264b7abf7020cb2c1608bd
api: tpyo

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extra : rebase_source : 9ed1ee91b9b382e8a760ffb4a95fcd11b9a3e306
api: moar tpyo

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extra : rebase_source : 5babef414b8538380b1847f86c10f32bef317437
api: even moar

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extra : rebase_source : a68339a3cdb9a4cba8e0252dee46c1e889062999
rest: add a note to the tune documentation about using --tune ssim/psnr

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extra : rebase_source : 45ff73b650eb83e3aab8c5eb0716809183b5da53
rest: add API docs with links to appropriate sections

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extra : rebase_source : cc5a6bbcfe39341ff22680f327319bad3b66dd17