Add docs for self-signed certificates

docs/documentation/platform/pki/certificates/certificates.mdx

@@ -19,10 +19,12 @@ where you can manage various aspects of its lifecycle including deployment to cl
 
 ## Guide to Issuing Certificates
 
-To issue a certificate, you must first create a [certificate profile](/documentation/platform/pki/certificates/profiles) and a [certificate template](/documentation/platform/pki/certificates/templates) to go along with it.
+To [issue a certificate](/documentation/platform/pki/concepts/certificate-lifecycle#enrollment-request-%2F-issuance), you must first create a [certificate profile](/documentation/platform/pki/certificates/profiles) and a [certificate template](/documentation/platform/pki/certificates/templates) to go along with it.
 
-The [enrollment method](/documentation/platform/pki/enrollment-methods/overview) configured on the certificate profile determines how a certificate is issued for it.
-Refer to the documentation for each enrollment method to learn more about how to issue certificates using it.
+- Self-Signed Certificates: To issue a [self-signed certificate](https://en.wikipedia.org/wiki/Self-signed_certificate), you must configure the certificate profile to use the `Self-Signed` issuer type. You can then use the [API enrollment method](/documentation/platform/pki/enrollment-methods/api) to request a self-signed certificate against it.
+- CA-Issued Certificates: To issue a certificate from a certificate authority, you must configure the certificate profile to use the `Certificate Authority` issuer type and select the [issuing CA](/documentation/platform/pki/ca/overview) to use. You can then use one of the [enrollment methods](/documentation/platform/pki/enrollment-methods/overview) to request a certificate against it.
+
+Refer to the documentation for each [enrollment method](/documentation/platform/pki/enrollment-methods/overview) to learn more about how to issue certificates using it.
 
 ## Guide to Renewing Certificates
 

docs/documentation/platform/pki/certificates/profiles.mdx

@@ -21,7 +21,8 @@ Here's some guidance on each field:
 
 - Name: A slug-friendly name for the profile such as `web-servers`.
 - Description: An optional description for the profile.
-- Issuing CA: The [issuing CA](/documentation/platform/pki/ca/overview) that should be used to issue certificates for the profile.
+- Issuer Type: The type of issuer that should be used to issue certificates for the profile; this can be either `Certificate Authority` or `Self-Signed`. If `Self-Signed` is selected, then the profile will only support the API enrollment method and be used to issue self-signed certificates over REST API.
+- Issuing CA: The [issuing CA](/documentation/platform/pki/ca/overview) that should be used to issue certificates for the profile when the **Issuer Type** is set to `Certificate Authority`.
 - Certificate Template: The [certificate template](/documentation/platform/pki/certificates/templates) that should be used to validate certificate requests for the profile.
 - Enrollment Method: The enrollment method that should be used to enroll certificates for the profile such as ACME, EST, API, etc.
 

frontend/src/pages/cert-manager/PoliciesPage/components/CertificateProfilesTab/CreateProfileModal.tsx

@@ -577,7 +577,7 @@ export const CreateProfileModal = ({
                   isDisabled={Boolean(isEdit)}
                 >
                   <SelectItem value="ca">Certificate Authority</SelectItem>
-                  <SelectItem value="self-signed">Self-signed</SelectItem>
+                  <SelectItem value="self-signed">Self-Signed</SelectItem>
                 </Select>
               </FormControl>
             )}