Fix docs style (#2322)

.github/ISSUE_TEMPLATE/bug.md

@@ -45,9 +45,9 @@ labels: 'bug, needs triage'
 
 <!-- Include as many relevant details about the environment you experienced the bug in -->
 
-* Docusaurus version used:
-* Environment name and version (e.g. Chrome 78.0.3904.108, Node.js 10.17.0):
-* Operating system and version (desktop or mobile):
+- Docusaurus version used:
+- Environment name and version (e.g. Chrome 78.0.3904.108, Node.js 10.17.0):
+- Operating system and version (desktop or mobile):
 
 ## Reproducible Demo
 

packages/docusaurus-init/templates/classic/docs/doc1.md

@@ -171,22 +171,12 @@ This line is also a separate paragraph, but... This line is only separated by a
 
 ## Admonitions
 
-:::note
-This is a note
-:::
+:::note This is a note :::
 
-:::tip
-This is a tip
-:::
+:::tip This is a tip :::
 
-:::important
-This is important
-:::
+:::important This is important :::
 
-:::caution
-This is a caution
-:::
+:::caution This is a caution :::
 
-:::warning
-This is a warning
-:::
+:::warning This is a warning :::

packages/docusaurus-init/templates/facebook/docs/doc1.md

@@ -171,22 +171,12 @@ This line is also a separate paragraph, but... This line is only separated by a
 
 ## Admonitions
 
-:::note
-This is a note
-:::
+:::note This is a note :::
 
-:::tip
-This is a tip
-:::
+:::tip This is a tip :::
 
-:::important
-This is important
-:::
+:::important This is important :::
 
-:::caution
-This is a caution
-:::
+:::caution This is a caution :::
 
-:::warning
-This is a warning
-:::
+:::warning This is a warning :::