DOCS Link to maintenance module's user guide

[raissanorth]

Since this is a direct dependency, all the user instructions are kept within the maintenance module's user guide.

[codecov-io]

Codecov Report

❗ No coverage uploaded for pull request base (1@7ac24c6). Click here to learn what that means.
The diff coverage is 16.66%.

@@         Coverage Diff          @@
##             1      #33   +/-   ##
====================================
  Coverage     ?   45.65%           
  Complexity   ?       29           
====================================
  Files        ?        4           
  Lines        ?       92           
  Branches     ?        0           
====================================
  Hits         ?       42           
  Misses       ?       50           
  Partials     ?        0

Impacted Files	Coverage Δ	Complexity Δ
src/Extensions/CheckComposerUpdatesExtension.php	94.11% <ø> (ø)	6 <0> (?)
src/Extensions/ComposerUpdateExtension.php	100% <ø> (ø)	2 <0> (?)
src/UpdateChecker.php	29.72% <ø> (ø)	11 <0> (?)
src/Extensions/ComposerLoaderExtension.php	32.35% <16.66%> (ø)	10 <1> (?)

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