4s-admin.1, 4s-import.1: fix ambiguities between minus / hyphens

man/4s-admin.1

@@ -82,7 +82,7 @@ options:
 Starts or stops all stores on the cluster.
 .El
 .Pp
-If the -a or --all option isn't present, then a space separated list of store
+If the \-a or \-\-all option isn't present, then a space separated list of store
 names to start or stop should be given.
 .Pp
 Each node is asked in turn to start or stop the 4s-backend process stores

man/4s-import.1

@@ -18,11 +18,11 @@ kbname
 .It Fl "v, \-\-verbose"
 Increase verbosity (by default success is silent)
 .It Fl "a, \-\-add"
-Ordinarily importing RDF to a model replaces any previous contents of that model, by using the --add flag this behaviour is overridden and any triples which were previously in the model are retained.
+Ordinarily importing RDF to a model replaces any previous contents of that model, by using the \-\-add flag this behaviour is overridden and any triples which were previously in the model are retained.
 .It Fl "M, \-\-model-default"
 Set a model (graph) URI which is used by default for all imported files
 .It Fl "m, \-\-model"
-Set a model (graph) URI for the next named file only (overrides -M if it has been used)
+Set a model (graph) URI for the next named file only (overrides \-M if it has been used)
 .It Fl "f, \-\-format"
 Tell the RDF parser the format of the files (if not specified the parser will guess)
 .El