doc: remove notice of dashes in V8 options

Previously only V8 options supported both dashes in them (making them
equivalent), but now Node.js also supports both styles so the note can
be removed.

Refs: nodejs#23020

Author: lundibundi

doc/node.1

@@ -227,16 +227,6 @@ and
 .
 .It Fl -v8-options
 Print V8 command-line options.
-.Pp
-Note: V8 options allow words to be separated by both dashes
-.Sy ( - )
-or underscores
-.Sy ( _ ) .
-.Pp
-For example,
-.Fl -stack-trace-limit
-is equivalent to
-.Fl -stack_trace_limit .
 .
 .It Fl -v8-pool-size Ns = Ns Ar num
 Set V8's thread pool size which will be used to allocate background jobs.