fix some minor grammar issues
Minor grammar and typo fixes for 2.0, 2.1 and 2.2
Fixed grammar and syntax in 02.3.md
Grammar and syntax fixes for 02.4.md
Grammar and typo fixes for 02.5.md
Grammar and typo fixes for 02.6.md
Fix grammar and typos for 02.7.md
Fixed a few typos for 02.8.md
Improve clarity, grammar and typos in 03.0.md and 03.1.md
Fix grammar and typos for 03.2.md
Fixed typos and grammar for 03.3.md
Edited 03.4.md for grammar, typos and improved clarity
Fix typos and grammar flow in 03.5.md
Fix grammar, typos and sentence flow for clarity
Fix typos, grammar and flow in 04.2.md
Correct grammar errors in 04.3.md
Fix typos and grammar for 04.4.md
Fix typos and grammar for 04.5.md
Fix grammar and typos for 04.6.md
Fix additional typos and grammatical errors