FIX: random.beta 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 #355 (7c3359a) into master (489b970) will increase coverage by 0.14%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #355      +/-   ##
==========================================
+ Coverage   52.09%   52.24%   +0.14%     
==========================================
  Files          24       24              
  Lines        2100     2094       -6     
  Branches      646      642       -4     
==========================================
  Hits         1094     1094              
+ Misses        590      587       -3     
+ Partials      416      413       -3     

Impacted Files	Coverage Δ
dpnp/random/dpnp_iface_random.py	38.81% <100.00%> (+0.50%)	⬆️

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