document transferrability of F14HashToken between instances
Summary: F14HashToken encapsulates the work of hash_function(), which is the same across F14 containers that have the same key_type and equal hash_function() (same type and operator==). This diff adds documentation that callers may rely on this fact, which means they can use this feature to reduce work if a single key is access in multiple maps/sets. (Note: this ignores all push blocking failures!) Reviewed By: shixiao Differential Revision: D7506737 fbshipit-source-id: 321032d619434501b1e0544962e54732bfc4c970
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