tpm2_hmac.1.md: Update man page
tpm2_hmac.1.md: Update man page

  1. Align text to proper width per coding guideline.
  2. Standardize tags to _OBJECT_ _AUTH_ _FILE_ _STDIN_ _STDOUT_ _ARG_.
  3. Prune options description for spurious and redundant text

Signed-off-by: Imran Desai <d01faadd01d89088a38277c634ffb396f2b368f8@intel.com>

01org/tpm2.0-tools,01org/tpm2.0-tools,01org/tpm2.0-tools