Add missing doc. for incremental on Dialyzer analysis

Author: kivra-pauoli

apps/rebar/src/rebar_prv_dialyzer.erl

@@ -87,6 +87,7 @@ desc() ->
     "success typing analysis\n"
     "`output_format` - configure whether the dialyzer_warnings file will have "
     "the `raw` or `formatted` output\n"
+    "`incremental` - incremental analysis mode, defaults to `false`\n"
     "\n"
     "For example, to warn on unmatched returns: \n"
     "{dialyzer, [{warnings, [unmatched_returns]}]}.\n"

rebar.config.sample

@@ -123,7 +123,8 @@
     {plt_prefix, "rebar3"},
     {base_plt_apps, [stdlib, kernel, crypto]},
     {base_plt_location, global}, % global | "/my/file/name"
-    {base_plt_prefix, "rebar3"}
+    {base_plt_prefix, "rebar3"},
+    incremental
 ]}.