Add documentation: Rule is (auto)fixable

[el-coder-sb]

Is your feature request related to a problem? Please describe. I can´t find any information about if there are any "Configuring Prefix and Suffix Rules" which are fixabel. Or better said: Would be helpful to have the information if a rule is (auto)fixable and if yes under which circumstances (regarding suffixes: surely only if only one allowed suffix ist given)

Describe the solution you'd like A flag or text in the documentation which indicates if a rule is (auto)fixable.

Additional context Somewhat related to #558.