Fix some typos

[AdamDang]

1 delete duplicated "the the"
2 keypair->key pair (use same format for key pair in this doc)

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[AdamDang]

/assign @c-knowles

[codecov-io]

Codecov Report

Merging #1489 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #1489   +/-   ##
=======================================
  Coverage   37.86%   37.86%           
=======================================
  Files          75       75           
  Lines        4608     4608           
=======================================
  Hits         1745     1745           
  Misses       2620     2620           
  Partials      243      243

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[mumoshu]

@AdamDang LGTM. Thanks for the fixes!