Update transform_primitive.py

[gsheni]

• num_words as a primitive is used as one of the dfs default args and in the docs
• However, the primitive name is numwords so if someone does ft.dfs(trans_primitives='numwords'), it will error
• Same thing with characters and num_characters
• Another option is the fix the docstrings
• This fixes this issue.

[codecov]

Codecov Report

Merging #419 into master will not change coverage.
The diff coverage is 100%.

@@           Coverage Diff           @@
##           master     #419   +/-   ##
=======================================
  Coverage   96.11%   96.11%           
=======================================
  Files          92       92           
  Lines        8162     8162           
=======================================
  Hits         7845     7845           
  Misses        317      317

Impacted Files	Coverage Δ
...retools/primitives/standard/transform_primitive.py	100% <100%> (ø)	⬆️
...uretools/tests/utils_tests/test_list_primitives.py	100% <100%> (ø)	⬆️

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