Formatted all pages according to guidelines.

pages/linux/base64.md

@@ -2,18 +2,18 @@
 
 > Encode or decode file or standard input, to standard output.
 
-- Encode a file
+- Encode a file:
 
 `base64 {{filename}}`
 
-- Decode a file
+- Decode a file:
 
 `base64 -d {{filename}}`
 
-- Encode from stdin
+- Encode from stdin:
 
 `{{somecommand}} | base64`
 
-- Decode from stdin
+- Decode from stdin:
 
 `{{somecommand}} | base64 -d`