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Typo fixed.

* @var{errno} is incorrect, when describing error returns - use
  @code{errno} instead.

* @ref{} should be followed by comma or full-stop (period). Make sure
  it is, or use @pxref{} instead.

Add index entries.

2^64-2 -> 2^63-1

Correct 2^63-2 to 2^64-2.

Add lfilelength and documentation.