Remove {{{ vim folding }}}

Was dicussed recently at https://externals.io/message/110028
but received no feedback. Let's try this...

Author: MaxSem

CODING_STANDARDS.md

@@ -272,15 +272,15 @@ use these rules.
 1. Extensions should be well tested using `*.phpt` tests. Read about that at
     [qa.php.net](https://qa.php.net/write-test.php) documentation.
 
-## Documentation and folding hooks
+## Documentation
 
 In order to make sure that the online documentation stays in line with the code,
 each user-level function should have its user-level function prototype before it
 along with a brief one-line description of what the function does. It would look
 like this:
 
 ```c
-/* {{{ proto int abs(int number)
+/* proto int abs(int number)
    Returns the absolute value of the number */
 PHP_FUNCTION(abs)
 {
@@ -289,12 +289,6 @@ PHP_FUNCTION(abs)
 /* }}} */
 ```
 
-The `{{{` symbols are the default folding symbols for the folding mode in Emacs
-and vim (`set fdm=marker`). Folding is very useful when dealing with large files
-because you can scroll through the file quickly and just unfold the function you
-wish to work on. The `}}}` at the end of each function marks the end of the
-fold, and should be on a separate line.
-
 The `proto` keyword there is just a helper for the `doc/genfuncsummary` script
 which generates a full function summary. Having this keyword in front of the
 function prototypes allows us to put folds elsewhere in the code without
@@ -303,7 +297,7 @@ messing up the function summary.
 Optional arguments are written like this:
 
 ```c
-/* {{{ proto object imap_header(int stream_id, int msg_no [, int from_length [, int subject_length [, string default_host]]])
+/* proto object imap_header(int stream_id, int msg_no [, int from_length [, int subject_length [, string default_host]]])
    Returns a header object with the defined parameters */
 ```