chore(docs): use https for docs links

[bduranleau-nr]

Change user-facing documentation links to use https instead of http

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (3411be5) 78.47% compared to head (9d41dd8) 78.47%.

Additional details and impacted files

@@           Coverage Diff           @@
##              dev     #809   +/-   ##
=======================================
  Coverage   78.47%   78.47%           
=======================================
  Files         189      189           
  Lines       26335    26335           
=======================================
  Hits        20666    20666           
  Misses       5669     5669           

Flag	Coverage Δ
agent-for-php-7.0	77.22% <ø> (ø)
agent-for-php-7.1	76.94% <ø> (ø)
agent-for-php-7.2	77.50% <ø> (ø)
agent-for-php-7.3	77.52% <ø> (ø)
agent-for-php-7.4	77.31% <ø> (ø)
agent-for-php-8.0	77.40% <ø> (ø)
agent-for-php-8.1	77.36% <ø> (ø)
agent-for-php-8.2	77.15% <ø> (ø)
agent-for-php-8.3	77.15% <ø> (ø)

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