(doc) syntactic fixes (#764)

(doc) syntactic fixes (#764)

FAQ.md
- "the name" -> "a name"
- "re install" -> "reinstall"
- Changed the sentence structure to accomodate the flow of "objective -> method to achieve the objective -> reason why the objective is desired", rather than "how we are going to do it -> what we are trying to do -> why it is important"

README.md
- "It's the reason" -> "That is why"
- "in it" -> "on it"
- "This program is free software" -> "This is a free software": reduce redundancy (program and software), and introduce a proper article
- "redistribute it and/or modify it" -> "redistribute and/or modify it"