Update rdoc.md (#1832)

Co-authored-by: Rico Sta. Cruz <rstacruz@users.noreply.github.com>

rdoc.md

@@ -28,7 +28,7 @@ layout: 2017/sheet
 # @option opts [String] :subject The subject
 # @option opts [String] :from ('nobody') From address
 # @option opts [String] :to Recipient email
-# @option opts [String] :body ('') The email's body 
+# @option opts [String] :body ('') The email's body
 ```
 
 ### Parameter types
@@ -46,6 +46,12 @@ layout: 2017/sheet
 #   :format => :dot
 ```
 
+### Exceptions
+```rb
+# @raise [AccountBalanceError] if the account does not have
+#   sufficient funds to perform the transaction
+```
+
 ### Inline
 
 ```markdown
@@ -54,6 +60,12 @@ _emphasized_
 +code+
 ```
 
+```markdown
+{ObjectName#method optional title}
+{Class::CONSTANT My constant's title}
+{#method_inside_current_namespace}
+```
+
 ```markdown
 https://www.example.com/
 See Models::User@Examples
@@ -135,4 +147,5 @@ Place this at the beginning of the file.
 
 * <https://docs.ruby-lang.org/en/2.1.0/RDoc/Markup.html>
 * <https://www.rubydoc.info/gems/yard/file/docs/GettingStarted.md>
+* <https://rubydoc.info/gems/yard/file/docs/Tags.md>
 {: .-also-see}