docs: Update pull request template headings for consistency

.github/PULL_REQUEST_TEMPLATE.md

@@ -1,16 +1,16 @@
 <!-- If your PR fixes an open issue, use `Closes #101` to link your PR with the issue. #101 stands for the issue number you are fixing -->
 
-## 🛠️ Fixes Issue
+### Fixes Issue
 
 <!-- Remove this section if not applicable -->
 
 <!-- Example: Closes #31 -->
 
-## 👨‍💻 Changes proposed
+### 👨‍💻 Changes proposed
 
 <!-- List all the proposed changes in your PR -->
 
-## ✔️ Check List (Check all the applicable boxes) <!-- Follow the below conventions to check the box -->
+### Check List (Check all the applicable boxes) <!-- Follow the below conventions to check the box -->
 
 <!-- Mark all the applicable boxes. To mark the box as done follow the following conventions -->
 <!--
@@ -22,8 +22,8 @@
 - [ ] This PR does not contain plagiarized content.
 - [ ] The title of my pull request is a short description of the requested changes.
 
-## 📄 Note to reviewers
+### Note to reviewers
 
 <!-- Add notes to reviewers if applicable -->
 
-## 📷 Screenshots
+### Screenshots