Update consumer.rst documentation for correct ordering of consumer su…

[wbarnha]

…bscription by pattern

Changes

Fixes documentation for consumer subscription by regex pattern.

Whenever I invoked, as the documentation specifies:

await consumer.start()
consumer.subscribe(pattern="^MyGreatTopic-.*$")

I always get errors indicating the following:

Traceback (most recent call last):
  File "/home/REDACTED/PycharmProjects/REDACTED", line REDACTED, in REDACTED
    await consumer.start()
  File "/home/REDACTED/PycharmProjects/REDACTED", line REDACTED, in REDACTED
    await consumer.seek_to_end()
  File "/home/REDACTED/PycharmProjects/REDACTED/venv/lib/python3.8/site-packages/aiokafka/consumer/consumer.py", line 824, in seek_to_end
    assert partitions, 'No partitions are currently assigned'
AssertionError: No partitions are currently assigned

When I run the following, my application works fine:

consumer.subscribe(pattern="^MyGreatTopic-.*$")
await consumer.start()

Or is there something I'm misunderstanding in the documentation?

Checklist

• I think the code is well written
• Unit tests for the changes exist
• Documentation reflects the changes
• Add a new news fragment into the CHANGES folder
  • name it <issue_id>.<type> (e.g. 588.bugfix)
  • if you don't have an issue_id change it to the pr id after creating the PR
  • ensure type is one of the following:
    • .feature: Signifying a new feature.
    • .bugfix: Signifying a bug fix.
    • .doc: Signifying a documentation improvement.
    • .removal: Signifying a deprecation or removal of public API.
    • .misc: A ticket has been closed, but it is not of interest to users.
  • Make sure to use full sentences with correct case and punctuation, for example: Fix issue with non-ascii contents in doctest text files.

[codecov]

Codecov Report

Merging #901 (dcb8494) into master (5ce5649) will decrease coverage by 0.04%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #901      +/-   ##
==========================================
- Coverage   97.59%   97.56%   -0.04%     
==========================================
  Files          30       30              
  Lines        5451     5451              
==========================================
- Hits         5320     5318       -2     
- Misses        131      133       +2     

Flag	Coverage Δ
cext	88.36% <ø> (-0.04%)	⬇️
integration	97.52% <ø> (-0.04%)	⬇️
purepy	97.10% <ø> (-0.04%)	⬇️
unit	38.10% <ø> (ø)

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see 1 file with indirect coverage changes

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