Update exporters README.md - otlploggrpc added

[marekjalovec]

• otlploggrpc added
• formatted for better readability

[linux-foundation-easycla]

The committers listed above are authorized under a signed CLA.

• ✅ login: marekjalovec / name: Marek Jalovec (6711075, 860a28b)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 81.8%. Comparing base (5051038) to head (860a28b).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##            main   #6423     +/-   ##
=======================================
- Coverage   81.8%   81.8%   -0.1%     
=======================================
  Files        283     283             
  Lines      24899   24899             
=======================================
- Hits       20381   20379      -2     
- Misses      4115    4117      +2     
  Partials     403     403             

see 1 file with indirect coverage changes

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