Multiple typos in `fluid.bufampgate~` reference file

[rconstanzo]

If there's a couple here, there's probably more elsewhere. Would be worth running all the text through a spell check separately from Max.

It's an "envelopE" follower, and a "Schmitt" trigger.

[tremblap]

most of them are corrected in @tedmoore PR's #122

[tedmoore]

@tremblap Is this closable?

[tremblap]

probably - @rconstanzo might want to check as the originator

[rconstanzo]

My comments (for this one) were just the typos, which I presume were sorted as they are quite easy fixes. So close time it is!