docs: fix typo in intro.rst

[rsaite]

Correct HTTPTXTransport to HTTPXTransport

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (7fb869a) to head (9339ef0).
⚠️ Report is 73 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##            master      #608    +/-   ##
==========================================
  Coverage   100.00%   100.00%            
==========================================
  Files           38        40     +2     
  Lines         2908      3327   +419     
==========================================
+ Hits          2908      3327   +419     

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