[Docs] Explain why integers must be quoted

[karenzone]

Fixes #73 Minor reformatting to emphasize either/or dictionary or dictionary_path config options

[guyboertje]

I think we should also add a warning that when using regex => true the user must ensure that the dictionary key strings are regex escaped properly. e.g. copied from a regex turorial...

There are 12 characters with special meanings: the backslash \, the caret ^, the dollar sign $, the
period or dot ., the vertical bar or pipe symbol |, the question mark ?, the asterisk or star *, the plus
sign +, the opening parenthesis (, the closing parenthesis ), the opening square bracket [, and the
opening curly brace {. These special characters are often called "metacharacters".