hashmap: migrate documentation from Documentation/technical into header
While at it, clarify the use of `key`, `keydata`, `entry_or_key` as well as documenting the new data pointer for the compare function. Rework the example. Signed-off-by: NStefan Beller <sbeller@google.com> Signed-off-by: NJunio C Hamano <gitster@pobox.com>
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