added known limitations to the bottom of the security providers readme

Author: ddsharpe

site/security_providers.md

@@ -97,7 +97,7 @@ topology:
 
 Prior to using this tooling to create or update a domain with a custom security provider, there are several prerequisites.  First, WebLogic Server requires the custom MBean JAR to be in the Oracle Home directory before it can be configured, WLSERVER/server/lib/mbeantypes.  Second, WebLogic Scripting Tool, WLST, requires that the schema JAR be placed in the Oracle Home directory before WLST offline can be used to configure it, ORACLEHOME/oracle_common/lib/schematypes.  Generating an MBean JAR documentation can be found in the WebLogic Server [documentation](https://docs.oracle.com/middleware/12213/wls/DEVSP/generate_mbeantype.htm#DEVSP617).  Generating the schema JAR can be done with the prepareCustomProvider script provided in the WebLogic Server installation.
 
-The format for a custom security provider is slightly different than for a built-in provider in that the custom provider must supply the class name of the provider in the model between the provider name and the attributes for the provider.  In the custom `CredentialMapper` example below, note the location in the model of 'examples.security.providers.SampleCredentialMapper':
+The format for a custom security provider is slightly different than for a built-in provider in that the custom provider must supply the package name of the provider in the model between the provider name and the attributes for the provider.  In the custom `CredentialMapper` example below, note the location in the model of 'examples.security.providers.SampleCredentialMapper':
 
 ```yaml
         CredentialMapper:
@@ -107,3 +107,7 @@ The format for a custom security provider is slightly different than for a built
                     CredentialMappingDeploymentEnabled: true:
 ```
 
+#### Known Limitations
+
+- `Adjudicator` provider types cannot be added or modified due to a limitation in WLST.
+- `PasswordCredentials` provider types cannot be updated in WLST online.