Add Text Document Content support (#377) · karthiknadig/lsprotocol@23afe90

'MarkedString' is obsolete: 'use MarkupContent instead.'

'MarkedString' is obsolete: 'use MarkupContent instead.'

'MarkedString' is obsolete: 'use MarkupContent instead.'

'MarkedString' is obsolete: 'use MarkupContent instead.'

'MarkedString' is obsolete: 'use MarkupContent instead.'

'MarkedString' is obsolete: 'use MarkupContent instead.'

'MarkedString' is obsolete: 'use MarkupContent instead.'

'MarkedStringWithLanguage' is obsolete: 'use MarkupContent instead.'

'MarkedString' is obsolete: 'use MarkupContent instead.'

'MarkedString' is obsolete: 'use MarkupContent instead.'

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