docs: update docs for multi metrics provider support

[mowies]

Part of #1144

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[codecov]

Codecov Report

Merging #1244 (48e51ae) into main (a84cbc7) will decrease coverage by 0.04%.
The diff coverage is n/a.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1244      +/-   ##
==========================================
- Coverage   58.94%   58.90%   -0.04%     
==========================================
  Files         128      128              
  Lines       10040    10040              
==========================================
- Hits         5918     5914       -4     
- Misses       3902     3906       +4     
  Partials      220      220              

see 3 files with indirect coverage changes

Flag	Coverage Δ
certificate-operator	64.15% <ø> (ø)
component-tests	59.06% <ø> (-0.87%)	⬇️
lifecycle-operator	78.24% <ø> (ø)
metrics-operator	77.57% <ø> (ø)
scheduler	21.75% <ø> (ø)

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[sonarqubecloud]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

No Coverage information
0.0% Duplication