Fix typo; clarify that err:XS0110 applies to any unsupported version

xproc/src/main/xml/specification.xml

@@ -6354,13 +6354,14 @@ If the attribute is not specified, the value
 <rfc2119>must</rfc2119> be used to evaluate XPath expressions subject
 to the constraints outlined in <xref linkend="xpath-context"/>.
 <error code="S0110">It is a <glossterm>static error</glossterm> if
-the requested XPath version is less than “<literal>3.1</literal>”</error>.</para>
+the requested XPath version is less than “<literal>3.1</literal>”</error> or is
+not supported by the processor.</para>
 <para><impl>If a pipeline does not request a specific XPath version, the version
 used is <glossterm>implementation-defined</glossterm>.</impl> <impl>If different
 pipelines or libraries declare different XPath versions, it is
 <glossterm>implementation-defined</glossterm> how those conflicts are resolved.</impl>
 An implementation might use different versions for different pipelines, or it might
-use the same version for all pipelines. <impl>If an implementation elects to us the
+use the same version for all pipelines. <impl>If an implementation elects to use the
 same version for all pipelines, the version selected is <glossterm>implementation-defined</glossterm>.
 </impl></para>
 </listitem>