Fix typo in role_statements.md

Fix the description of `to_role_id`. It looks like an error resulting from copy & paste.

Signed-off-by: kxxt <[email protected]>
Acked-By: Daniel Burgener <[email protected]>

Author: kxxt

src/role_statements.md

@@ -217,7 +217,7 @@ role. Multiple entries consist of a space separated list enclosed in braces '{}'
 
 *to_role_id*
 
-One or more *role* or *attribute_role* identifiers that identify the current
+One or more *role* or *attribute_role* identifiers that identify the target
 role. Multiple entries consist of a space separated list enclosed in braces '{}'.
 
 **The statement is valid in:**