fix typo

Signed-off-by: Rudi Grinberg <[email protected]>

doc/dune-files.rst

@@ -668,7 +668,7 @@ Executables can also be linked as object or shared object files. See
   pulled in. This field is available since the 2.0 version of the dune
   language.
 
-- ``(embed_in_plugin_libraries <library-list>)`` especifies a list of libraries
+- ``(embed_in_plugin_libraries <library-list>)`` specifies a list of libraries
   to link statically when using ``plugin`` linking mode. By default, no
   libraries are linked in. Note that you may need to also use the ``-linkall``
   flag if some of the libraries listed here are not referenced from any of the