doc: correct orthography, word forms and missing/extraneous words

man/systemd.link.xml

@@ -70,7 +70,7 @@
     name in <filename>/usr/lib</filename>. This can be used to
     override a system-supplied link file with a local file if needed.
     As a special case, an empty file (file size 0) or symlink with the
-    same name pointing to <filename>/dev/null</filename> disable the
+    same name pointing to <filename>/dev/null</filename> disables the
     configuration file entirely (it is "masked").</para>
 
     <para>The link file contains a <literal>[Match]</literal> section,
@@ -217,7 +217,7 @@
                 generated which is guaranteed to be the same on every
                 boot for the given machine and the given device, but
                 which is otherwise random. This feature depends on ID_NET_NAME_*
-                properties existing for the link. On hardware where these
+                properties to exist for the link. On hardware where these
                 properties are not set, the generation of a persistent MAC address
                 will fail.</para>
               </listitem>