Rewroded some contents and fixed some lists of elements

Author: javiereguiluz

components/yaml/yaml_format.rst

@@ -34,9 +34,9 @@ they can also be unquoted:
 
     "A double-quoted string in YAML"
 
-Quoted styles are useful when a string starts or ends with one or more
-relevant spaces, because unquoted strings are trimmed on both ends when parsing
-their contents.
+Quoted styles are useful when a string starts or end with one or more relevant
+spaces, because unquoted strings are trimmed on both end when parsing their
+contents. Quotes are required when the string contains special or reserved characters.
 
 When using single-quoted strings, any single quote ``'`` inside its contents
 must be doubled to escape it:
@@ -49,25 +49,8 @@ Strings containing any of the following characters must be quoted. Although you
 can use double quotes, for these characters it is more convenient to use single
 quotes, which avoids having to escape any backslash ``\``:
 
-* ``:``
-* ``{``
-* ``}``
-* ``[``
-* ``]``
-* ``,``
-* ``&``
-* ``*``
-* ``#``
-* ``?``
-* ``|``
-* ``-``
-* ``<``
-* ``>``
-* ``=``
-* ``!``
-* ``%``
-* ``@``
-* ``\```
+* ``:``, ``{``, ``}``, ``[``, ``]``, ``,``, ``&``, ``*``, ``#``, ``?``, ``|``,
+  ``-``, ``<``, ``>``, ``=``, ``!``, ``%``, ``@``, ``\```
 
 The double-quoted style provides a way to express arbitrary strings, by
 using ``\`` to escape characters and sequences. For instance, it is very useful
@@ -80,42 +63,11 @@ when you need to embed a ``\n`` or a Unicode character in a string.
 If the string contains any of the following control characters, it must be
 escaped with double quotes:
 
-* ``\0``
-* ``\x01``
-* ``\x02``
-* ``\x03``
-* ``\x04``
-* ``\x05``
-* ``\x06``
-* ``\a``
-* ``\b``
-* ``\t``
-* ``\n``
-* ``\v``
-* ``\f``
-* ``\r``
-* ``\x0e``
-* ``\x0f``
-* ``\x10``
-* ``\x11``
-* ``\x12``
-* ``\x13``
-* ``\x14``
-* ``\x15``
-* ``\x16``
-* ``\x17``
-* ``\x18``
-* ``\x19``
-* ``\x1a``
-* ``\e``
-* ``\x1c``
-* ``\x1d``
-* ``\x1e``
-* ``\x1f``
-* ``\N``
-* ``\_``
-* ``\L``
-* ``\P``
+* ``\0``, ``\x01``, ``\x02``, ``\x03``, ``\x04``, ``\x05``, ``\x06``, ``\a``,
+  ``\b``, ``\t``, ``\n``, ``\v``, ``\f``, ``\r``, ``\x0e``, ``\x0f``, ``\x10``,
+  ``\x11``, ``\x12``, ``\x13``, ``\x14``, ``\x15``, ``\x16``, ``\x17``, ``\x18``,
+  ``\x19``, ``\x1a``, ``\e``, ``\x1c``, ``\x1d``, ``\x1e``, ``\x1f``, ``\N``,
+  ``\_``, ``\L``, ``\P``
 
 Finally, there are other cases when the strings must be quoted, no matter if
 you're using single or double quotes: