Corrected links, spacing issues on the common-attributes-include.markdown page

1. Removed  [common attribute] from each of the attributes because it wasn't working and it wasn't needed. For example, [action][Promise Types and Attributes#action] takes the user to action under Common Attributes.

2. A missing space between in [Common Attributes Section][Promise Types andAttributes#Common Attributes] was causing the link to appear incorrectly. This has been fixed.

3. Added a line to the text to give more clarity: "The common attributes are as follows:"