[doc] perlop: Expanding a table of attributes of operators

[rsFalse]

Where
https://perldoc.perl.org/perlop#Operator-Precedence-and-Associativity

Description
I suggest to expand a table of attributes of operators. I'm not sure is this a good idea, but I'm leaving here as a suggestion. I wrote earlier the same into perlmonks forum ( https://perlmonks.org/?node_id=11126869 - "For discussion: operator attributes - associativity, chainity and ability to short-circuit" ). Here I'll add an example of a table, which can be further improved. I split some same precedence operators into separate lines but added vertical lines there. I'll attach a file with table for better readability - Operator_attribute_table.txt :

  ASSOC.     COND. SHORT-C. CHAINS  OP.
  left                              terms and list operators (leftward)
  left                              ->
  nonassoc                          ++ --
  right                             **
  right                             ! ~ \ and unary + and -
  left                              =~ !~
  left                              * / % x
  left                              + - .
  left                              << >>
  nonassoc                          named unary operators
  LEFT       no    yes      yes     < > <= >= lt gt le ge
| LEFT       no    yes      yes     == != eq ne ~~
| LEFT       no    no       no      <=> cmp
  nonassoc                          isa
  left                              &
  left                              | ^
  left       yes   yes      no      &&
  left       yes   yes      no      || //
  nonassoc                          ..  ...
  right      yes   no       no      ?:
  right                             = += -= *= etc. goto last next redo dump
  left                              , =>
  nonassoc                          list operators (rightward)
  right                             not
  left       yes   yes      no      and
| left       yes   yes      no      or
| left       no    no       no      xor

Some reasons for that table are:

1. in the current table when fields are filled with "chained" we do not see what is a direction of associativity (left or right).
2. 'and' and 'or' are conditional but 'xor' isn't (by meaning of returned value). I think this info can be condensed here into table.

Also I think that this table can be a bit closer to the beginning of document. It is convenient to have it near the section name, where you can land by opening a link.

[Grinnz]

You probably want to format your suggestion as a verbatim block, beginning and ending with three grave accents: ```