filter/constants.xml Fix typo, add a description (#4854)

Author: mmalferov

reference/filter/constants.xml

@@ -135,7 +135,7 @@
    </term>
    <listitem>
     <simpara>
-     This flags wraps scalar inputs into a one element <type>array</type>
+     This flag wraps scalar inputs into a one element <type>array</type>
      for filters which operate on arrays.
     </simpara>
    </listitem>
@@ -264,18 +264,21 @@
    <listitem>
     <simpara>
      Returns &true; for <literal>"1"</literal>,
-     <literal>"true"</literal>,
+     <literal>1</literal> including binary, octal and hexadecimal notations, <literal>1.0</literal>,
+     <literal>"true"</literal>, <literal>true</literal>,
      <literal>"on"</literal>,
      and <literal>"yes"</literal>.
     </simpara>
     <simpara>
      Returns &false; for <literal>"0"</literal>,
-     <literal>"false"</literal>,
+     <literal>0</literal> including binary, octal and hexadecimal notations, <literal>0.0</literal>,
+     <literal>"false"</literal>, <literal>false</literal>,
      <literal>"off"</literal>,
      <literal>"no"</literal>, and
      <literal>""</literal>.
     </simpara>
     <simpara>
+     String values are compared case-insensitively.
      The return value for non-boolean values depends on the
      <constant>FILTER_NULL_ON_FAILURE</constant>.
      If it is set, &null; is returned, otherwise &false; is returned.
@@ -499,7 +502,7 @@
    </term>
    <listitem>
     <simpara>
-     Validates whether the <acronym>URL</acronym> name is valid according to
+     Validates whether the <acronym>URL</acronym> is valid according to
      <link xlink:href="&url.rfc;2396">RFC 2396</link>.
     </simpara>
     <variablelist xml:id="filter.constants.validation.url.options">
@@ -949,6 +952,9 @@
       <member><literal>&amp;</literal></member>
      </simplelist>
      and characters with an ASCII value less than 32.
+     Unlike the <constant>FILTER_SANITIZE_FULL_SPECIAL_CHARS</constant> filter, the
+     <constant>FILTER_SANITIZE_SPECIAL_CHARS</constant> filter ignores the
+     <constant>FILTER_FLAG_NO_ENCODE_QUOTES</constant> flag.
     </para>
     <simpara>
      Optionally it can strip specified characters if used together with