address a comment

Co-authored-by: Gina Peter Banyard <[email protected]>

Author: SakiTakamachi

reference/bc/bcmath/number/compare.xml

@@ -37,8 +37,9 @@
  <refsect1 role="returnvalues">
   &reftitle.returnvalues;
   <simpara>
-   Returns <literal>0</literal> if the two numbers are equal, <literal>1</literal> if the
-   this object is larger than the <parameter>num</parameter>, <literal>-1</literal> otherwise.
+   Returns <literal>0</literal> if the two numbers are equal,
+   <literal>1</literal> if <varname>$this</varname> is greater than <parameter>num</parameter>,
+   <literal>-1</literal> otherwise.
   </simpara>
  </refsect1>