Update schema/bom-1.7.xsd

Co-authored-by: Jan Kowalleck <jan.kowalleck@owasp.org>
Signed-off-by: Steve Springett <steve@springett.us>

Author: stevespringett

schema/bom-1.7.xsd

@@ -7285,7 +7285,7 @@ limitations under the License.
                         <xs:element name="certificateExtensions" minOccurs="0" maxOccurs="1">
                             <xs:annotation>
                                 <xs:documentation>
-                                    A certificate extension is an optional field that provides additional information about the certificate or its use. Extensions are used to convey additional information beyond the standard fields.
+                                    A certificate extension is a field that provides additional information about the certificate or its use. Extensions are used to convey additional information beyond the standard fields.
                                 </xs:documentation>
                             </xs:annotation>
                             <xs:complexType>