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Updated docs and added docs for code editor

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Akash Yadav
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# Java code actions
## Common code actions
Common code actions which can be performed for most of the Java symbols.
| Code action | Description |
| --------------------- | ---------------------------------------------------------------------------------------------------- |
| Comment line | Comment out the selected line. |
| Uncomment line | Uncomment the selected line. |
| Find references | Finds the references to the selected variable, method, class, etc. |
| Go to definition | Find the file and the location where the selected symbol is defined then navigates to that location. |
| Organize imports | Organizes the imports in current file. |
| Remove unused imports | Removes all imports that are not used in the file. |
## Diagnostic related actions
Code actions that can be performed for diagnositics only.
| Code action | Description |
| -------------------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ |
| Add import | Imports the selected, non-imported class. |
| Add throws | Adds the selected throwable to the `throws` signature of the current method. |
| Create missing method | Creates the missing method. The name and signature of the method that will be created is extracted from the diagnostic. |
| Convert to block | Moves the RHS of an unused field to the `static` block. |
| Implement abstract method | Implemented the un-implemented abstract methods that a class inherits from it's superclass/interface. |
| Remove class | Removes the unused class |
| Remove method | Removes the unused method |
| Remove unused throws | Removes the unused `throws` signature from a method. The unused throws warning is shown when a method defines exceptions (with the `throws` keyword) that can be thrown from the method but does not actually throw that exception in it's body. |
| Suppress unchecked warning | Adds the `@SuppressWarnings("unchecked")` annotation to the method. |
| Convert to statement | Converts a unused variable declaration to a statement. |
## Generators
These code actions help you add various implementations to your code.
| Code action | Description |
| ---------------------------- | ----------------------------------------------------------------------------------------------------------------------------------------------------- |
| Generate constructor | A field based action. Allows you to choose some fields from the current class and generates a constructor which accepts and initializes those fields. |
| Generate missing constructor | Generates the missing constructor implementation with the `super` constructor invocation. |
| Generate setters and getters | A field based action. Allows you to choose some fields from the current class and generates setters and getters for those fields. |
| Generate `toString()` | A field based action. Allows you to choose some fields from the current class and generates the `toString()` implementation with those fields. |
| Override superclass methods | A method based action. Allows you to choose methods from the superclass and override them all at once. |