docs: fix wrong MockFunctions.md log result

[iibe]

It seems a little strange to me. Why are we showing the first and second arguments of the first function call (lines 108-109 of the MockFunctions.md). It would be more correct to write .calls[0][0] and .calls[1][0] to show the first argument of function

calls.

MockFunctions.md typo fixed

Summary

It fixes documentation typo. Therefore, the reader will correctly understand the text if we fix this typo.

Test plan

http://prntscr.com/15t2xmb

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[codecov-commenter]

Codecov Report

Merging #11588 (f90b795) into master (7be63ef) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master   #11588   +/-   ##
=======================================
  Coverage   69.00%   69.00%           
=======================================
  Files         312      312           
  Lines       16331    16331           
  Branches     4730     4730           
=======================================
  Hits        11269    11269           
  Misses       5034     5034           
  Partials       28       28           

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[seastian]

Same as #11556

[iibe]

Hmm, yeah. Thanks. I didn't notice it.

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