docs(goTemplate): Fix bullet list (argoproj#17611)

Signed-off-by: Wout Scheepers <wscheep@users.noreply.github.com>

docs/operator-manual/applicationset/GoTemplate.md

@@ -13,6 +13,7 @@ with hyphens and truncating at 253 characters. This is useful when making parame
 names.
 
 Another `slugify` function has been added which, by default, sanitizes and smart truncates (it doesn't cut a word into 2). This function accepts a couple of arguments:
+
 - The first argument (if provided) is an integer specifying the maximum length of the slug.
 - The second argument (if provided) is a boolean indicating whether smart truncation is enabled.
 - The last argument (if provided) is the input name that needs to be slugified.