Outdated PTA Policy Link in Syllabus

[timo-liu]

http://www.cs.ucdavis.edu/blog/pta-policy/ now directs to https://cs.ucdavis.edu/news (as of at latest September 29, 2020), instead of the PTA policy outline.

[powerjg]

@kaustav-goswami can you update this to point to https://cs.ucdavis.edu/policies and https://cs.ucdavis.edu/graduate/policies

[powerjg]

@timo-liu Thanks for letting us know!