8299090: Specify coordinate order for additional CaptureCallState parameters on class as well

Reviewed-by: pminborg, mcimadamore

Author: JornVernee

src/java.base/share/classes/java/lang/foreign/Linker.java

@@ -303,8 +303,8 @@ static Option firstVariadicArg(int index) {
          *          before it can be overwritten by the Java runtime, or read through conventional means}
          * <p>
          * A downcall method handle linked with this option will feature an additional {@link MemorySegment}
-         * parameter directly following the target address parameter. This memory segment must be a
-         * native segment into which the captured state is written.
+         * parameter directly following the target address, and optional {@link SegmentAllocator} parameters.
+         * This memory segment must be a native segment into which the captured state is written.
          *
          * @param capturedState the names of the values to save.
          * @see CaptureCallState#supported()
@@ -323,6 +323,10 @@ static CaptureCallState captureCallState(String... capturedState) {
          * <p>
          * Execution state is captured by a downcall method handle on invocation, by writing it
          * to a native segment provided by the user to the downcall method handle.
+         * For this purpose, a downcall method handle linked with the {@link #captureCallState(String[])}
+         * option will feature an additional {@link MemorySegment} parameter directly
+         * following the target address, and optional {@link SegmentAllocator} parameters.
+         * This parameter represents the native segment into which the captured state is written.
          * <p>
          * The native segment should have the layout {@linkplain CaptureCallState#layout associated}
          * with the particular {@code CaptureCallState} instance used to link the downcall handle.