Update 2.md

fixing typo and improve readability.
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Merge pull request #37 from kr15to/patch-10

Update 2.md
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typo fix
typo on grammer
spelling typo
Merge pull request #40 from pabitrapadhy/patch-2

typo on grammer
Merge pull request #41 from pabitrapadhy/patch-3

spelling typo
Merge pull request #39 from pabitrapadhy/patch-1

typo fix
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Merge branch 'master' of github.com:chukong/programmers-guide
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