Adding connection step to bloom filter examples

[nermiller]

Fixes #2415, adds a connect step to bloom commands

[savynorem]

@nermiller sorry I didn't articulate this well - the connection will need to be after the import, then the connection name is what needs to be used - also, the return from create is a boolean, it can't actually be used to alter the data structure, so they'll need to be more like
import redis r = redis.Redis() r.bf().create("bloom", .01, 1000) r.bf().add("bloom", "foo")

The return values are pretty much only used as a success / fail / did something change type of measure, they don't return a way to access the object.

[nermiller]

@savynorem please review again. Thanks!

[codecov-commenter]

Codecov Report

Base: 92.22% // Head: 92.19% // Decreases project coverage by -0.02% ⚠️

Coverage data is based on head (5435cf9) compared to base (f492f85).
Patch has no changes to coverable lines.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2478      +/-   ##
==========================================
- Coverage   92.22%   92.19%   -0.03%     
==========================================
  Files         113      113              
  Lines       29239    29239              
==========================================
- Hits        26965    26958       -7     
- Misses       2274     2281       +7     

Impacted Files	Coverage Δ
tests/test_asyncio/test_search.py	98.26% <0.00%> (-0.35%)	⬇️
tests/test_cluster.py	96.86% <0.00%> (-0.23%)	⬇️
redis/asyncio/connection.py	86.44% <0.00%> (-0.13%)	⬇️

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[savynorem]

👍 looks great to me!