chore: missing colons in issue template (TanStack#800)

Author: JonathanStoye

.github/ISSUE_TEMPLATE/bug_report.md

@@ -25,14 +25,14 @@ If applicable, add screenshots to help explain your problem.
 
 **Desktop (please complete the following information):**
  - OS: [e.g. iOS]
- - Browser [e.g. chrome, safari]
- - Version [e.g. 22]
+ - Browser: [e.g. chrome, safari]
+ - Version: [e.g. 22]
 
 **Smartphone (please complete the following information):**
  - Device: [e.g. iPhone6]
  - OS: [e.g. iOS8.1]
- - Browser [e.g. stock browser, safari]
- - Version [e.g. 22]
+ - Browser: [e.g. stock browser, safari]
+ - Version: [e.g. 22]
 
 **Additional context**
 Add any other context about the problem here.