docs: fix remarks options to have no spaces (#4867)

Feedback from a user: the docs used to say that "False Positive" and "Not
Affected" were valid values in the remarks field, but you actually can't have
spaces in those so the correct values are "FalsePositive" and "NotAffected"

Signed-off-by: Terri Oda <[email protected]>

Author: terriko

doc/how_to_guides/use_intermediate_reports.md

@@ -62,8 +62,10 @@ The "remarks" section allows 6 values:
 2. Unexplored
 3. Confirmed
 4. Mitigated
-5. False Positive
-6. Not Affected
+5. FalsePositive
+6. NotAffected
+
+(Note the lack of spaces)
 
 More details such as how a CVE was mitigated or why it can be ignored can be
 added into the "comments" section.  Other fields such as severity and score can