docs: fix caching example by using .clone() method

[sarunast]

The .json() cannot be resolved more than once for the same request

Types of changes

• Chore (a non-breaking change which is related to package maintenance)
• Bug fix (a non-breaking change which fixes an issue)
• New feature (a non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Description

Fix caching example mentioned #217

Checklist:

• My change requires an update to the official documentation.
• All TSDoc comments are up-to-date and new ones have been added where necessary.
• All new and existing tests are passing.

[lihbr]

Hey @sarunast, thank you so much for taking the time to fix this one! Looking good to me~

[codecov-commenter]

Codecov Report

Merging #218 (15ea6f6) into master (b141ba7) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##            master      #218   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           19        19           
  Lines          316       316           
  Branches        60        60           
=========================================
  Hits           316       316           

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