docs: fix documentation sdk url

[vmunich]

Proposed changes

/api/sdk was changed to /sdk, this PR fixes the URL.

Types of changes

• Docs (documentation only changes)

Checklist

• I have read the CONTRIBUTING documentation
• I have read the WRITING DOCUMENTATION guidelines

[codecov-io]

Codecov Report

Merging #35 into master will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master      #35   +/-   ##
=========================================
  Coverage     87.73%   87.73%           
  Complexity       48       48           
=========================================
  Files            10       10           
  Lines           106      106           
=========================================
  Hits             93       93           
  Misses           13       13

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