[1.0.0] Fix formatting issues and typos

[sgayangi]

Purpose

This PR resolves the issues pointed out as comments in the following PRs:

• https://github.com/wso2/docs-apk/pull/340
• https://github.com/wso2/docs-apk/pull/359
• https://github.com/wso2/docs-apk/pull/330
• https://github.com/wso2/docs-apk/pull/496
• https://github.com/wso2/docs-apk/pull/572