[chore] [processor/batch] docs: stop recommending Batch processor

[andrzej-stencel]

Removes the sentence in Batch processor docs recommending using the component on every collector.

This implements one of the points proposed in:

• [processor/batch] Batch processor drops data that failed to be sent #12443

• Stop recommending to configure the Batch processor on every collector pipeline.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.52%. Comparing base (e7b140f) to head (ad4a999).

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #13191      +/-   ##
==========================================
- Coverage   91.54%   91.52%   -0.03%     
==========================================
  Files         522      522              
  Lines       28955    28955              
==========================================
- Hits        26508    26500       -8     
- Misses       1931     1937       +6     
- Partials      516      518       +2     

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