Fix 'feeling of doing' typo in tutorials.rst and a missing word in reference.rst

[C-Kapsalis]

I was reading through the docs and noticed a handful of small typos. This PR fixes the two that don't appear to be covered by other open PRs:

• tutorials.rst: "establishing the feeling to doing" → "feeling of doing" (matches the "feeling of doing" phrasing used elsewhere on the page)
• reference.rst: "the material that your user needs know where they expect to find it" was missing a word — dropped "know" so it reads "...the material that your user needs where they expect to find it"

I also spotted a few others while reading, but they already have open PRs, so I've left them out to avoid duplicating work:

• compass.rst: duplicated "think you" — already in Fix small typos in the tutorial and compass sections #115
• tutorials.rst: doubled "know" in "If you know know in advance" — already in Fix small typos in the tutorial and compass sections #115, Update tutorials.rst Duplicate word #120, fix minor typo/grammatical issues #134, Remove repeated word #143, Correct some wording on the tutorials page #160
• quality.rst: repeated "what" in "what exactly what we mean" — already in Update quality.rst #121 and Fixed a few typos in quality.rst. #139

A note on the reference.rst fix: #128 and #158 also address that sentence, but resolve it the other way ("...user needs to know where..."). I went with dropping "know", which reads more naturally to me, but happy to switch to the "to know" version if you prefer consistency with those PRs.

All cosmetic, no content changes.