changing description of mime type to media type and Markdown string to Markdown text
changing description of mime type to media type and Markdown string to Markdown text

nteract/composition,rgbkrk/nteract,rgbkrk/nteract,nteract/nteract,nteract/composition,nteract/nteract,nteract/nteract,nteract/nteract,rgbkrk/nteract,nteract/nteract,rgbkrk/nteract,nteract/composition,rgbkrk/nteract