Update if-else.py

[Guy-Sowden]

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1. This pull request resolves #115

(^Fill in the issue number after #)

2. Description

Update if-else.py to fix grammatical errors and clarify some of the wording, as well as adding a new example demonstrating using the equal and not equals operators.

3. Fill in checklist by marking [x]

• [x] I've read the CONTRIBUTING.md
• [ ] I was assigned to this issue
• [x] My code is formatted using required linting
• [x] I've run my code locally and checked it works

[funbeedev]

@Guy-Sowden Good suggestions. Thanks for the contribution!