📝 Note that entry_parser is deprecated.

[coderanger]

What this PR does / why we need it:

Minor doc addition so new users like me don't get side tracked by "should I be using entry_parser or a pipeline stage?"

[CLAassistant]

All committers have signed the CLA.

[codecov-commenter]

Codecov Report

Merging #2397 into master will decrease coverage by 0.13%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #2397      +/-   ##
==========================================
- Coverage   61.72%   61.59%   -0.14%     
==========================================
  Files         160      160              
  Lines       13577    13577              
==========================================
- Hits         8381     8363      -18     
- Misses       4569     4592      +23     
+ Partials      627      622       -5     

Impacted Files	Coverage Δ
pkg/promtail/positions/positions.go	47.32% <0.00%> (-13.40%)	⬇️
pkg/canary/comparator/comparator.go	77.82% <0.00%> (-2.42%)	⬇️
pkg/logql/evaluator.go	92.47% <0.00%> (-0.41%)	⬇️
pkg/promtail/targets/file/filetarget.go	70.48% <0.00%> (+1.80%)	⬆️
pkg/promtail/targets/file/tailer.go	76.13% <0.00%> (+2.27%)	⬆️

[owen-d]

lgtm