Revert "Typo and phrasing change"

This reverts commit 5ab2748a0c6c4ad0aa82b950bb9cc7b0af114706.
Merge remote-tracking branch 'upstream/master'
Merge remote-tracking branch 'upstream/master'
Correct typos

1.  Change reference to Python name attribute to use code formatting (to
distinguish it from ordinary language use of name).
2. Move fullstop from inside bracketed clause to outside.
3. Change upper case T after colon to lower case t.
Correct typos

1. Remove full stop between $X$ and :
2. Change "computational-simpler" to "computationally-simpler"
Merge pull request #162 from williamscott/master

Correct typos