Don't use "(saw)", "(pbuh)", etc. in titles. There's a specific meta.Islam.SE post: Don't append "SAWW", "PBUH", "RA", "AS" etc in front of names and titles if the original author hasn't and don't change it either
Prefer English over Arabic transliteration in titles. This is an English-language site, so the default should be English (although this should be balanced with searchability).
When Arabic is necessary, descriptors help. A title like "What's in Riyad As-Saliheen?What's in Riyad As-Saliheen?" is equivalent to "What's in [something]?". From the title, we learn that "Riyad As-Saliheen" is an object that things can be in, and the author wants to know what's inside it. (I changed it to Where do the ahadith in Riyad As-Saliheen come from, and what grade are they?Where do the ahadith in Riyad As-Saliheen come from, and what grade are they? to match the wording in the question.)
Beware that "Qur'an X:Y" is not uniquely defined as some authors include "Bismillah al-rahman al-rahim" in their numbering while others don't.
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