microhttpd: fixed typo in the documentation [skip ci]

src/modules/microhttpd/doc/microhttpd_admin.xml

@@ -43,7 +43,7 @@
 			<itemizedlist>
 			<listitem>
 			<para>
-				<emphasis>libmicrohhtpd</emphasis> - libmicrohttpd library
+				<emphasis>libmicrohttpd</emphasis> - libmicrohttpd library
 			</para>
 			</listitem>
 			</itemizedlist>