If you don't quite understand what you're looking at (output of deparse, perl syntax), then
ppi_dumper can help you look at the right part of the manual, an example
$ ppi_dumper 2
PPI::Document
PPI::Statement::Include
PPI::Token::Word 'use'
PPI::Token::Whitespace ' '
PPI::Token::Word 'constant'
PPI::Token::Whitespace ' '
PPI::Token::Word 'X'
PPI::Token::Whitespace ' '
PPI::Token::Operator '=>'
PPI::Token::Whitespace ' '
PPI::Token::Number '1'
PPI::Token::Operator '/'
PPI::Token::Number '3'
PPI::Token::Structure ';'
PPI::Token::Whitespace '\n'
PPI::Token::Whitespace '\n'
So PPI::Token::Operator tells you "=>" is an operator
If you read perl/"perltoc" then you'll know that operators are documented in perlop
App::PPI::Dumper / ppi_dumper
wxPPIxregexplain.pl