fix gitignore and tiny touch to the slides

Author: liesnikov

slides/.gitignore

@@ -1,6 +1,8 @@
 # Unless you want to add it manually
 
 main.pdf
+result
+result/
 
 ### LaTeX ###
 ## Core latex/pdflatex auxiliary files:

slides/main.md

@@ -107,11 +107,10 @@ f k _ t (succ zero)
 ```
 
 * replace `_` with `?¹`
+* look up `k` yields not fully elaborated term *yet*
 * you get a constraint `?¹ ~ F ?²`
 * looking up `t` yields type `G`
 * produce a constraint `F ?² ~ G`
-* look up `k` yields not fully elaborated term *yet*
-* can't solve it for now, so just stash it and hope we can solve it later
 
 ## How do constraints work