doc: fix syntax

doc/doxygen/chapters/510_configure_options.doxy

@@ -494,14 +494,14 @@ Specify the blas library to be used by some of the examples. Librairies availabl
 Enable linking with LevelDB if available
 </dd>
 
-<dt>--with-hdf5-include-dir=<path></dt>
+<dt>--with-hdf5-include-dir=<c>path</></dt>
 <dd>
 \anchor with-hdf5-include-dir
 \addindex __configure__--with-hdf5-include-dir
 Specify the directory where is stored the header hdf5.h.
 </dd>
 
-<dt>--with-hdf5-lib-dir=<path></dt>
+<dt>--with-hdf5-lib-dir=<c>path</c></dt>
 <dd>
 \anchor with-hdf5-lib-dir
 \addindex __configure__--with-hdf5-lib-dir