next.js

c1991c6b - docs: fix grammar for dynamic routes catch-all explanation and give better examples (#48181)

docs: fix grammar for dynamic routes catch-all explanation and give better examples (#48181) ### Why? Making the explanation more obvious because it took quite a while for me to figure out the difference between catch-all and optional catch-all, and I think others may feel the same way too. --------- Co-authored-by: JJ Kasper <jj@jjsweb.site>