Fix Spelling on CosmosSDK Docs README.md

[jpthor]

Spelling

• Targeted PR against correct branch (see CONTRIBUTING.md)

• Linked to github-issue with discussion and accepted design OR link to spec that describes this work.

• Wrote tests

• Updated relevant documentation (docs/)

• Added a relevant changelog entry: clog add [section] [stanza] [message]

• rereviewed Files changed in the github PR explorer

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For Admin Use:

• Added appropriate labels to PR (ex. wip, ready-for-review, docs)
• Reviewers Assigned
• Squashed all commits, uses message "Merge pull request #XYZ: [title]" (coding standards)

[codecov]

Codecov Report

Merging #4424 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #4424   +/-   ##
=======================================
  Coverage   56.29%   56.29%           
=======================================
  Files         245      245           
  Lines       15437    15437           
=======================================
  Hits         8690     8690           
  Misses       6114     6114           
  Partials      633      633

[codecov]

Codecov Report

Merging #4424 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #4424   +/-   ##
=======================================
  Coverage   56.29%   56.29%           
=======================================
  Files         245      245           
  Lines       15437    15437           
=======================================
  Hits         8690     8690           
  Misses       6114     6114           
  Partials      633      633