M06-Unit 7 - Instructions image and texts need some changes

[v-asamim]

Module: M06-Unit 7

Lab/Demo: Unit 7

Task: 04, 05

Step: 03, 13

Description of issue
Instructions image and texts need updates

Repro steps:

1. Exercise 1, Task 4, Step 3 -> "Firewall tier" from instructions should change to "Firewall SKU"
2. Exercise 1, Task 4, Step 3 -> "Availability zone " is not in the instructions.
3. Exercise 1, Task 5, Step 13 -> "Address prefix" from instructions should change to "Address prefix destination"
4. Exercise 1, Task 5, Step 13 -> "Destination IP addresses/CIDR ranges" is not in the instructions.
5. Exercise 1, Task 5, Step 16 -> Image needs update.

Pull Request Link

#193

Relevant screenshots

Task: 04

Task: 05