Minor updates to documentation and doc links

[scouten-adobe]

No description provided.

[codecov]

Codecov Report

Merging #168 (bc03580) into main (e7ec845) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #168   +/-   ##
=======================================
  Coverage   97.93%   97.93%           
=======================================
  Files           9        9           
  Lines        1599     1599           
=======================================
  Hits         1566     1566           
  Misses         33       33           

Impacted Files	Coverage Δ
src/xmp_date_time.rs	98.30% <ø> (ø)
src/xmp_error.rs	100.00% <ø> (ø)
src/xmp_gps.rs	100.00% <ø> (ø)
src/xmp_meta.rs	99.80% <ø> (ø)
src/xmp_value.rs	100.00% <ø> (ø)

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