apt-cache(8): Drop the #versions >= #package names comparison

Closes: #691281

doc/apt-cache.8.xml

@@ -122,8 +122,7 @@ Reverse Provides:
        </listitem>
 
        <listitem><para><literal>Total distinct</literal> versions is the number of package versions 
-       found in the cache; this value is therefore at least equal to the 
-       number of total package names. If more than one distribution is being accessed
+       found in the cache. If more than one distribution is being accessed
        (for instance, "stable" and "unstable"), this value
        can be considerably larger than the number of total package names.</para>
        </listitem>