Fix GitLab MD formatting.

Sigh.

.gitlab/issue_templates/New bug.md

@@ -1,9 +1,9 @@
-** Bug summary **
+**Bug summary**
 
-(Summarise the bug encountered concisely here. Please fill in all text
-in parentheses like this.)
+(Summarise the bug encountered concisely here. Please replace all text
+in parentheses like these.)
 
-** About you **
+**About you**
 
  * Geary version: (x.y.z)
  * Installation method: (Package? Flathub? Source code?)
@@ -11,21 +11,21 @@ in parentheses like this.)
  * Your operating: system and version (Ubuntu 16.04? Fedora 28? Rolled your own?)
  * Email provider: (Gmail, Yahoo!, Outlook.com, or someone else?)
 
-** Steps to reproduce**
+**Steps to reproduce**
 
  1. (Step one)
  2. (Step two)
  3. (...)
 
-** What is the current bug behavior? **
+**What is the current bug behavior?**
 
 (What actually happens)
 
-** What is the expected correct behavior? **
+**What is the expected correct behavior?**
 
 (What you see happening instead)
 
-** Relevant logs and/or screenshots **
+**Relevant logs and/or screenshots**
 
 (Paste any relevant logs - please use code blocks (```) to format
 console output, logs, and code as it's very hard to read otherwise. If

.gitlab/issue_templates/New feature.md

@@ -1,15 +1,15 @@
-** Feature summary **
+**Feature summary**
 
 (Describe what you would like to be able to do with Geary that you
 currently cannot do, such as "send email whilst underwater". Please
-fill in all text in parentheses like this.)
+replace all text in parentheses like these.)
 
-** How would you like it to work? **
+**How would you like it to work?**
 
 (If you can think of a way Geary might be able to do this, let us know
 here.)
 
-** Relevant links, screenshots, etc **
+**Relevant links, screenshots, etc**
 
 (If you have further information about the missing feature such as
 technical documentation or a similar feature in another email