Some markup improvements

Author: Girgias

reference/filter/constants.xml

@@ -304,7 +304,7 @@
    </term>
    <listitem>
     <simpara>
-     Alias of <constant>FILTER_VALIDATE_BOOL</constant>.
+     &Alias; <constant>FILTER_VALIDATE_BOOL</constant>.
      The alias was available prior to the introduction of its canonical
      name in PHP 8.0.0.
     </simpara>
@@ -523,8 +523,15 @@
       <listitem>
        <simpara>
         Requires the <acronym>URL</acronym> to contain a scheme part.
-        (Deprecated as of PHP 7.3.0 and removed as of PHP 8.0.0, as it is implied by the filter already.)
        </simpara>
+       <warning>
+        <simpara>
+         <emphasis>DEPRECATED</emphasis> as of PHP 7.3.0 and
+         <emphasis>REMOVED</emphasis> as of PHP 8.0.0.
+         This is because it is always implied by the
+         <constant>FILTER_VALIDATE_URL</constant> filter.
+        </simpara>
+       </warning>
       </listitem>
      </varlistentry>
      <varlistentry xml:id="constant.filter-flag-host-required">
@@ -535,8 +542,15 @@
       <listitem>
        <simpara>
         Requires the <acronym>URL</acronym> to contain a host part.
-        (Deprecated as of PHP 7.3.0 and removed as of PHP 8.0.0, as it is implied by the filter already.)
        </simpara>
+       <warning>
+        <simpara>
+         <emphasis>DEPRECATED</emphasis> as of PHP 7.3.0 and
+         <emphasis>REMOVED</emphasis> as of PHP 8.0.0.
+         This is because it is always implied by the
+         <constant>FILTER_VALIDATE_URL</constant> filter.
+        </simpara>
+       </warning>
       </listitem>
      </varlistentry>
      <varlistentry xml:id="constant.filter-flag-path-required">
@@ -848,7 +862,7 @@
    </term>
    <listitem>
     <simpara>
-     Alias of <constant>FILTER_UNSAFE_RAW</constant>.
+     &Alias; <constant>FILTER_UNSAFE_RAW</constant>.
     </simpara>
    </listitem>
   </varlistentry>
@@ -892,10 +906,14 @@
    </term>
    <listitem>
     <simpara>
-     Alias of <constant>FILTER_SANITIZE_STRING</constant>.
-     (<emphasis>Deprecated</emphasis> as of PHP 8.1.0,
-     use <function>htmlspecialchars</function> instead.)
+     &Alias; <constant>FILTER_SANITIZE_STRING</constant>.
     </simpara>
+    <warning>
+     <simpara>
+      <emphasis>Deprecated</emphasis> as of PHP 8.1.0,
+      use <function>htmlspecialchars</function> instead.
+     </simpara>
+    </warning>
    </listitem>
   </varlistentry>
   <varlistentry xml:id="constant.filter-sanitize-encoded">
@@ -1108,10 +1126,14 @@ string(5) "12.34"
    </term>
    <listitem>
     <simpara>
-     Alias of <constant>FILTER_SANITIZE_ADD_SLASHES</constant>.
-     (<emphasis>DEPRECATED</emphasis> as of PHP 7.3.0 and
-     <emphasis>REMOVED</emphasis> as of  PHP 8.0.0)
+     &Alias; <constant>FILTER_SANITIZE_ADD_SLASHES</constant>.
     </simpara>
+    <warning>
+     <simpara>
+      <emphasis>DEPRECATED</emphasis> as of PHP 7.3.0 and
+      <emphasis>REMOVED</emphasis> as of PHP 8.0.0.
+     </simpara>
+    </warning>
    </listitem>
   </varlistentry>
  </variablelist>