Update example of Redisearch creating index

[mzdehbashi-github]

When creating index, fields should be passed inside an iterable (e.g. list or tuple)
otherwise, if passing multiple fields, any field after the first one is not included in the schema when executing FT.CREATE command.

Pull Request check-list

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• Does $ tox pass with this change (including linting)?
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Description of change

Fixed the example, to pass fields inside a tuple (as schema), so all the fields get included in the schema when creating index (when executing command FT.CREATE)

The existing code:

r.ft(index_name).create_index(TextField("play", weight=5.0), TextField("ball"))

results in:

['FT.CREATE', '1:shoppinghistory:index', 'NOOFFSETS', 'SCHEMA', 'play', 'TEXT', 'WEIGHT', 5.0]

As you can see, it does not include field ball

[codecov-commenter]

Codecov Report

Patch coverage has no change and project coverage change: -0.02 ⚠️

Comparison is base (e1017fd) 92.29% compared to head (7072bbc) 92.28%.

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Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2703      +/-   ##
==========================================
- Coverage   92.29%   92.28%   -0.02%     
==========================================
  Files         116      116              
  Lines       29890    29890              
==========================================
- Hits        27588    27583       -5     
- Misses       2302     2307       +5     

see 3 files with indirect coverage changes

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