FIX: random.chisquare fallback

[samir-nasibli]

Description

• update fallback
• update docstring

Checklist

• Docstrings for all functions
• Unit tests:
• Clean style in the spirit of PEP8

[codecov]

Codecov Report

Merging #356 (2645a91) into master (489b970) will increase coverage by 0.05%.
The diff coverage is 42.85%.

@@            Coverage Diff             @@
##           master     #356      +/-   ##
==========================================
+ Coverage   52.09%   52.14%   +0.05%     
==========================================
  Files          24       24              
  Lines        2100     2096       -4     
  Branches      646      643       -3     
==========================================
- Hits         1094     1093       -1     
+ Misses        590      588       -2     
+ Partials      416      415       -1     

Impacted Files	Coverage Δ
dpnp/random/dpnp_iface_random.py	38.42% <42.85%> (+0.11%)	⬆️

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