[#1375] Fix minor documentation inconsistencies in the User Guide and Developer Guide

[rolandyuwy]

Fixes #1375

Courtesy of @kkangs0226 for spotting these mistakes. 👍
I have taken time to find and fix additional typos and errors explained below:

Screenshots depict current bugs before fixing.
1) Standardize capitalization of instructions and explanations.

2) Fix formatting (bolding) issues.

3) Correct typos.

4) Standardize hyperlinking of sections.

Proposed commit message:

Current User Guide and Developer Guide contains several 
inconsistencies such as typos, grammatical errors and lack of 
standardization amongst sections.

Fixing these bugs will improve readability of these documentation.

Let's,
* standardize capitalization of instructions and explanations
* fix formatting issues
* correct typos
* standardize hyperlinking of sections  

[Tejas2805]

Left some comments!

[rolandyuwy]

Left some comments!

Changes have been made, thank you!

[Tejas2805]

One last nit. Rest LGTM!

[jamessspanggg]

seems like there is another PR #1379 that fixes the same thing, I think we should stick with one PR to fix these inconsistencies

[fzdy1914]

@rolandyuwy Do you agree that @kkangs0226 is the main contributor? If so, I will let @kkangs0226 merge your changes to #1379 and also mention that you are a co-author.

[fzdy1914]

@rolandyuwy Do you agree that @kkangs0226 is the main contributor? If so, I will merge your changes to #1379 and also mention that you are a co-author.

If so, please also provide your co-author detail like below:

Co-authored-by: Tejas Bhuwania <35946746+Tejas2805@users.noreply.github.com>
Co-authored-by: WANG CHAO <1229983126@qq.com>

[fzdy1914]

Close due to #1396