docs/rfc: Remove pair declare description for GSP-729

[JinnyYi]

We need to declare all the pairs for StorageHTTPSigner operations for now, otherwise, services.PairUnsupportedError will be returned.

[codecov]

Codecov Report

Merging #735 (74ee923) into master (ba30a03) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #735   +/-   ##
=======================================
  Coverage   12.47%   12.47%           
=======================================
  Files          22       22           
  Lines        1483     1483           
=======================================
  Hits          185      185           
  Misses       1291     1291           
  Partials        7        7           

Flag	Coverage Δ
unittests	12.47% <ø> (ø)

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