add indicators for events and modifiers (#1954)

(cherry picked from commit eda29e06b2e2d9c7af249ea11ab4e2f65f39d4c3)

docs/contract.hbs

@@ -66,7 +66,7 @@
 {{#each modifiers}}
 [.contract-item]
 [[{{anchor}}]]
-==== `pass:normal[{{name}}({{> typed-variable-array args}})]`
+==== `pass:normal[{{name}}({{> typed-variable-array args}})]` [.visibility]#modifier#
 
 {{natspec.devdoc}}
 
@@ -84,7 +84,7 @@
 {{#each events}}
 [.contract-item]
 [[{{anchor}}]]
-==== `pass:normal[{{name}}({{> typed-variable-array args}})]`
+==== `pass:normal[{{name}}({{> typed-variable-array args}})]` [.visibility]#event#
 
 {{natspec.devdoc}}