Formatted all pages according to guidelines.

pages/common/tree.md

@@ -2,26 +2,26 @@
 
 > Show the contents of the current directory as a tree.
 
-- Show files and directories with a depth of 'num'
+- Show files and directories with a depth of 'num':
 
 `tree -L {{num}}`
 
-- Show directories only
+- Show directories only:
 
 `tree -d`
 
-- Show hidden files too
+- Show hidden files too:
 
 `tree -a`
 
-- Print human readable size of files
+- Print human readable size of files:
 
 `tree -h`
 
-- Print the full path for each file
+- Print the full path for each file:
 
 `tree -f`
 
-- Print the tree without lines and indentation. Useful when used with -f
+- Print the tree without lines and indentation. Useful when used with -f:
 
 `tree -i`