Hi friends,
I have created my own custom field called as a "Technical Reviewer"(Single User Picker field). For that i added the following description "KB article assigned to Technical Reviewer".
In field configuration also i mentioned like above, but after i adding that field into my screen the description shows with some additional tag like "<p>KB article assigned to Technical Reviewer.<p>". Please refer the attached screen shot of it. 
Please share your thoughts,
Thanks in advance,
Karthik A.