DOC:ArmaProcess class documentation typo fix

[tadeze]

Fixed typo for variable name in the documentation example for ArimaProcess class.

[coveralls]

Coverage decreased (-0.06%) to 82.811% when pulling 8beccc1 on tadeze:master into 3d87728 on statsmodels:master.

[codecov-io]

Codecov Report

Merging #4593 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #4593   +/-   ##
=======================================
  Coverage   80.26%   80.26%           
=======================================
  Files         564      564           
  Lines       85592    85592           
  Branches     9679     9679           
=======================================
  Hits        68702    68702           
+ Misses      14662    14661    -1     
- Partials     2228     2229    +1

Impacted Files	Coverage Δ
statsmodels/tsa/arima_process.py	78.22% <ø> (ø)	⬆️
statsmodels/stats/descriptivestats.py	24.13% <0%> (ø)	⬆️

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[ChadFulton]

LGTM, @josef-pkt is it safe to merge yet?

[josef-pkt]

There is no restriction for merging into master for 0.10.
0.9.0 release is out and backporting goes to or will happen in maintenance if needed.

[ChadFulton]

Thanks for letting me know @josef-pkt, and thank you @tadeze for the improvement!