Updated description of issue templates.

.github/ISSUE_TEMPLATE/bug_report.md

@@ -1,6 +1,6 @@
 ---
 name: Bug report
-about: Create a report to help us improve
+about: Create a report to help us improve.
 title: ''
 labels: ''
 assignees: ''

.github/ISSUE_TEMPLATE/custom.md

@@ -1,6 +1,6 @@
 ---
 name: Custom issue template
-about: Describe this issue template's purpose here.
+about: Do you have a question related to the project? Use this template.
 title: ''
 labels: ''
 assignees: ''

.github/ISSUE_TEMPLATE/feature_request.md

@@ -1,6 +1,6 @@
 ---
 name: Feature request
-about: Suggest an idea for this project
+about: Suggest an idea for this project.
 title: ''
 labels: ''
 assignees: ''