doc: remove ambiguous 'considered'

PR-URL: #51207
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Tobias Nießen <tniessen@tnie.de>

Author: Trott

doc/api/crypto.md

@@ -2851,7 +2851,7 @@ added: v15.6.0
 
 * Type: {string}
 
-The date/time from which this certificate is considered valid.
+The date/time from which this certificate is valid.
 
 ### `x509.validTo`
 
@@ -2861,7 +2861,7 @@ added: v15.6.0
 
 * Type: {string}
 
-The date/time until which this certificate is considered valid.
+The date/time until which this certificate is valid.
 
 ### `x509.verify(publicKey)`