Fix various typos/grammer in the docs
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['What do yo think of the documentation btw ?\r\nWhat parts would you like to see improved ?'
 'I like how concise and straightforward the docs are.\r\n\r\nFew things that would further improve the docs IMO:\r\n* the usage example of `Dataset.formatted_as` in https://huggingface.co/docs/datasets/master/processing.html\r\n* the "Open in Colab" button would be nice where it makes sense (we can borrow this from the transformers project + link to HF Forum)']
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This PR:
* fixes various typos/grammer I came across while reading the docs
* adds the "Install with conda" installation instructions

Closes #1959 
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