Update Complex Method doc - closes #1009

[schalkms]

No description provided.

[arturbosch]

Wonderful!
I guess we should add a configuration option to exclude scope functions, what do you think?

[schalkms]

@arturbosch I'm not sure. This scope functions certainly introduce another path through the application. That's why I'd for now leave as it is.

[codecov-io]

Codecov Report

❗ No coverage uploaded for pull request base (master@80be66d). Click here to learn what that means.
The diff coverage is 100%.

@@            Coverage Diff            @@
##             master    #1773   +/-   ##
=========================================
  Coverage          ?   79.82%           
  Complexity        ?     1937           
=========================================
  Files             ?      324           
  Lines             ?     5472           
  Branches          ?     1009           
=========================================
  Hits              ?     4368           
  Misses            ?      581           
  Partials          ?      523

Impacted Files	Coverage Δ	Complexity Δ
...rturbosch/detekt/rules/complexity/ComplexMethod.kt	96.29% <ø> (ø)	11 <0> (?)
...ab/arturbosch/detekt/api/internal/McCabeVisitor.kt	91.42% <100%> (ø)	18 <0> (?)

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