fix typos in documentation: opiton->option, specific->specify

doc/index.docbook

@@ -525,7 +525,7 @@ module based just on the module name. Because of this, a concept called
 
 <para>By using a module set, you can quickly declare many Git modules to be
 downloaded and built, as if you'd typed out a separate module declaration for
-each one. The <link linkend="conf-repository">repository</link> opiton is
+each one. The <link linkend="conf-repository">repository</link> option is
 handled specially to setup where each module is downloaded from, which every
 other option contained in the module set is copied to every module generated
 in this fashion.</para>
@@ -1520,7 +1520,7 @@ name to reference a specific Git repository base URL in later <link
 linkend="module-sets">module set</link> declarations, which is useful for
 quickly declaring many Git modules to build.</para>
 
-<para>You must specific two things (separated by a space): The name to assign
+<para>You must specify two things (separated by a space): The name to assign
 to the base URL, and the actual base URL itself. For example:</para>
 
 <para>