Typos in DEBUG_PRINT

[nulls]

What's done:

• fixed description in available-rules.md
• fixed typo in Warnings.kt

[codecov]

Codecov Report

Merging #1338 (3d2e902) into master (9423868) will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##             master    #1338   +/-   ##
=========================================
  Coverage     82.03%   82.03%           
  Complexity     2561     2561           
=========================================
  Files           106      106           
  Lines          7275     7275           
  Branches       2085     2085           
=========================================
  Hits           5968     5968           
  Misses          354      354           
  Partials        953      953           

Flag	Coverage Δ
unittests	82.03% <100.00%> (ø)

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Impacted Files	Coverage Δ
...tlin/org/cqfn/diktat/ruleset/constants/Warnings.kt	98.07% <100.00%> (ø)

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