org.texi (Checkboxes, Radio lists): Fix typos

* org.texi (Checkboxes, Radio lists): Fix typos.

doc/org.texi

@@ -4487,7 +4487,7 @@ off a box while there are unchecked boxes above it.
 @orgcmd{C-c C-c,org-toggle-checkbox}
 Toggle checkbox status or (with prefix arg) checkbox presence at point.
 With a single prefix argument, add an empty checkbox or remove the current
-one@footnote{`C-u C-c C-c' on the @emph{first} item of a list with no checkbox
+one@footnote{@kbd{C-u C-c C-c} on the @emph{first} item of a list with no checkbox
 will add checkboxes to the rest of the list.}.  With a double prefix argument, set it to @samp{[-]}, which is
 considered to be an intermediate state.
 @orgcmd{C-c C-x C-b,org-toggle-checkbox}
@@ -15988,7 +15988,7 @@ Here is a @LaTeX{} example.  Let's say that you have this in your
 \end@{comment@}
 @end example
 
-Pressing `C-c C-c' on @code{a new house} and will insert the converted
+Pressing @kbd{C-c C-c} on @code{a new house} and will insert the converted
 @LaTeX{} list between the two marker lines.
 
 @node Dynamic blocks, Special agenda views, Tables in arbitrary syntax, Hacking