Merge bitcoindevkit/bdk#487: Use "Description" instead of "Descriptive Title" in SoB Issue Template

084ec036a53c94b4a3f7a7e9d6abd7842d99a939 Use "Description" instead of "Descriptive Title" (rajarshimaitra)

Pull request description:

  <!-- You can erase any parts of this template not applicable to your Pull Request. -->

  ### Description

  <!-- Describe the purpose of this PR, what's being adding and/or fixed -->

  The `Descriptive Title` part is already in the issue title, and we can use `Description` in the issue body.

  ### Notes to the reviewers

  <!-- In this section you can include notes directed to the reviewers, like explaining why some parts
  of the PR were done in a specific way -->

  ### Checklists

  #### All Submissions:

  * [x] I've signed all my commits
  * [x] I followed the [contribution guidelines](https://github.com/bitcoindevkit/bdk/blob/master/CONTRIBUTING.md)

ACKs for top commit:
  thunderbiscuit:
    ACK 084ec03.
  notmandatory:
    ACK 084ec036a53c94b4a3f7a7e9d6abd7842d99a939

Tree-SHA512: 2fc365066849033cce056a46bc9e8ab2d931aa45fd2799ebebe3e07bb789c458491ebf2c05e5868bdff63f60dec0657043f3374135dcfbc79a1f89a2562b1883

.github/ISSUE_TEMPLATE/summer_project.md

@@ -32,7 +32,7 @@ fundamentals - achievable over 12-weeks. Below are just a few types of ideas:
    create new innovations and new perspectives for your project.
 -->
 
-**Descriptive Title**  
+**Description**
 <!-- Description: 3-7 sentences describing the project background and tasks to be done. -->  
 
 **Expected Outcomes**