Fixed #4321: Outdated info regarding multiple consecutive number signs

Logically reverts cf220d0

Author: derickr

appendices/migration84/incompatible.xml

@@ -464,6 +464,15 @@
   </sect3>
  </sect2>
 
+ <sect2 xml:id="migration84.incompatible.date">
+  <title>Date</title>
+
+  <para>
+   <literal>number</literal> symbols in <link linkend="datetime.formats.relative">relative formats</link>
+   once again accept multiple signs, e.g. <literal>+-2</literal>.
+  </para>
+ </sect2>
+
  <sect2 xml:id="migration84.incompatible.dom">
   <title>DOM</title>
 

reference/datetime/formats.xml

@@ -1201,14 +1201,22 @@ object(DateTimeImmutable)#1 (3) {
        </row>
       </thead>
       <tbody>
+       <row>
+        <entry>8.4.0</entry>
+        <entry>
+         <literal>number</literal> now again accepts a plus sign followed by a
+         minus sign, e.g. <literal>+-2</literal>, and other combinations of
+         multiple signs.
+        </entry>
+       </row>
        <row>
         <entry>8.2.0</entry>
         <entry>
-         <literal>number</literal> no longer accepts multiple signs,
-         e.g. <literal>+-2</literal>.
+         <literal>number</literal> no longer accepts a plus sign followed by a
+         minus sign, e.g. <literal>+-2</literal>.
         </entry>
        </row>
-      <row>
+       <row>
         <entry>7.0.8</entry>
         <entry>
          Weeks always start on monday. Formerly, sunday would also be considered