Update spec/2023-07-draft.md

Co-authored-by: Maarten Sijm <[email protected]>

Author: 2 people

spec/2023-07-draft.md

@@ -480,7 +480,7 @@ Filetype can be either `.tex` for LaTeX files, `.md` for Markdown, or `.pdf` for
 Auxiliary files needed exclusively by the solution description files should all be in `solution/`.
 `solution.<language>.<filetype>` should reference auxiliary files as if the working directory is `solution/`.
 Additionally, all images in `statement/` can also be referenced as if the working directory is `statement/`.
-Note that if a file with the same name exists in both `statement/` and `solution/` only the one in `solution/` can be referenced.
+Note that if a file with the same name exists in both `statement/` and `solution/`, only the one in `solution/` can be referenced.
 
 Exactly how the solution description is used is up to the user or tooling.