[Pubmatic]The example value for the dctr bid param shows an unneeded \

[robin-crazygames]

https://docs.prebid.org/dev-docs/bidders/pubmatic.html

The example value for the dctr bid param is 'key1:abc\|key2:123'. That \ should be removed.

I tried to create a PR for this (#6390), but just removing the \ breaks the markdown table. So I have no idea what the actual fix is.