Update docs/spec/draft/threats.md

Co-authored-by: Aditya Sirish <[email protected]>
Signed-off-by: Zachariah Cox <[email protected]>

docs/spec/draft/threats.md

@@ -64,7 +64,7 @@ consumer's trust.
 
 <details><summary>Software producer intentionally creates a malicious revision of the source</summary>
 
-*Threat:* An producer intentionally creates a malicious revision with the intent of harming their consumers.
+*Threat:* A producer intentionally creates a malicious revision with the intent of harming their consumers.
 
 *Mitigation:*
 This kind of attack cannot be directly mitigated through SLSA controls.