chore(docs): cleanup API docs (#1244)

* Modified the jazzy config to use symbol declarations as documentation for all uncommented public symbols, remove documentation coverage metric from the generated docs, add a docset icon, and include build tool settings in the config so they no longer have to be passed on the command line. 

* Corrected a typo in a documentation comment in Amplify.swift.

Author: ameter

.jazzy.yaml

@@ -3,9 +3,19 @@ author: Amazon Web Services
 github_url: https://github.com/aws-amplify/amplify-ios
 
 exclude:
-- Pods
+  - Pods
 
 clean: true
 skip_undocumented: false
+undocumented_text: ""
+hide_documentation_coverage: true
 sdk: iphone
 theme: apple
+build_tool_arguments:
+  - -workspace
+  - Amplify.xcworkspace
+  - -scheme
+  - Amplify
+
+docset_icon: readme-images/amplify-icon.png
+

Amplify/Amplify.swift

@@ -10,7 +10,7 @@
 /// but clients can access specific plugins by invoking `getPlugin` on a category and issuing methods directly to
 /// that plugin.
 ///
-/// - Warning: It is a serious programmer to invoke any of the category APIs (like `Analytics.record()` or
+/// - Warning: It is a serious error to invoke any of the category APIs (like `Analytics.record()` or
 /// `API.mutate()`) without first registering plugins via `Amplify.add(plugin:)` and configuring Amplify via
 /// `Amplify.configure()`. Such access will cause a preconditionFailure.
 ///