Remove extraneous word from instructions

Editor assessment

The subject states exactly what changed: an extraneous word was removed from the instructions. It is fully understandable without the diff, and the fix type is accurate; no scope is given even though the curriculum area is obvious, a minor gap that does not hurt comprehension for a change this small. No body is present and none is needed, since a one-word deletion carries no motivation beyond what the subject says. The PR reference is the only footer and it is well formed. Style is clean throughout: imperative mood, no trailing period, short subject, consistent language. A small change communicated exactly as it should be.