typo issues-part1

[MinMah23]

• [x] In Revision History table, correct "section" to "sections"
• [x] The paragraph before the General Information, verification and validation should be in camel?
• [x] Section 3.2, "-" should be omitted.
• [x] In Section 3.2, you wrote "a test matrix with detailed mapping connecting the testing performed to the system requirements.", change "testing" to "tests".
• [x] In Section 4: you wrote "This section describes the plan for the Solar Cooker Energy Calculator system." but it's better to mention what is the plan for?
• [x] Design and Implementation in this section should not start with uppercase.
• [x] According to writing checklist, correct the "Dr. Spencer Smith " to avoid extra space.

[DeeshaPatel]

I have done the changes according to the comments. 12fc698