Release notes: SpyFu v4.6 is live

**Fixed Bugs
* [SF-16867] – Weekly Tracking – PDF export failing
* [SF-18997] – Terms are being interpreted as a TLD on Keyword Research
* [SF-19037] – Sitewide – UK Keyword Research showing some $ where it should be £
* [SF-19038] – Overview – (UK Keyword) Overview Pulling in US Data

** Task
* [SF-19039] – Cookie Collector – Region selection for pg2 cookies; Update saving and settings methods to use section flag.
* [SF-19051] – Sitewide – Audit UK data sitewide

** Improvement
* [SF-16973] – Update Lucene and API for better default PPC Keywords Sort
* [SF-17925] – Overview – (PPC) Hot Dog Nav missing Adwords Advisor
* [SF-19017] – MSF Keyword Grid – Add click change column and cog to manage columns