Remove Jaybird 5 removed feature

Author: mrotteveel

src/docs/asciidoc/chapters/exceptionhandling/exceptionhandling.adoc

@@ -232,11 +232,7 @@ SQL state is `0A000`.
 SQL state is `42000`.
 ** `org.firebirdsql.jdbc.field.TypeConversionException` -- this exception is thrown when the driver is asked to perform a type conversion that is not defined in the JDBC specification, or otherwise not supported by Jaybird.
 For a table of allowed type conversions see <<Data Type Conversion Table>>.
-* until:[Jaybird 5] Subclasses of `javax.resource.ResourceException` are thrown by the JCA layer when an error happens in the JCA-related code.
-The upper layer converts this exception into a subclass of `java.sql.SQLException`.
-If the `ResourceException` was caused by a `SQLException` or `GDSException`, the latter is extracted during conversion, preserving the error code.
-If `ResourceException` was caused by an error condition not related to an error returned by the database engine, the error code of the `SQLException` remains 0.
-* Subclasses of `javax.transaction.XAException` are thrown when an XA protocol error happens in the JCA/XCA layer.
+* Subclasses of `javax.transaction.XAException` are thrown when an XA protocol error happens in the XCA layer.
 Similar to the previous case, `XAException` can wrap the `SQLException` or `GDSException`, which are extracted during exception conversion to preserve the error code.
 
 === SQL states

src/docs/asciidoc/chapters/introduction/introduction.adoc

@@ -37,7 +37,7 @@ local, and embedded implementations of the driver.
 Here all connection and transaction management happens.
 Additionally, this layer adapts the GDS-ng API for use by the JDBC layer.
 +
-The XCA layer is a replacement of the JCA layer of previous versions, and should be considered an internal implementation detail.
+The XCA layer is a replacement of the JCA layer of earlier versions, and should be considered an internal implementation detail.
 * The JDBC layer is an implementation of the https://jcp.org/en/jsr/detail?id=221[JDBC Specification^].
 
 Separately, the <<services,Services API>> -- also layered on GDS-ng -- allows you to manage databases and the server itself.

src/docs/asciidoc/reference/connection/defaultholdable.adoc

@@ -11,7 +11,6 @@ With the default result set holdability, close on commit, doing this yields a `S
 The property is accessible as:
 
 * connection property `defaultResultSetHoldable` with no value, empty value or `true` (aliases: `defaultHoldable` and `result_set_holdable`);
-* until:[Jaybird 5] database parameter buffer member `isc_dpb_result_set_holdable`;
 * `FirebirdConnectionProperties` interface methods `isDefaultResultSetHoldable()` and `setDefaultResultSetHoldable(boolean)`
 
 [WARNING]