Update doc for region_jcl module to include new member behaviour

Author: andrewhughes101

docs/source/modules/region_jcl.rst

@@ -855,6 +855,8 @@ region_data_sets
     dsn
       The data set name of the JCL data set to override the template.
 
+      The data set name can also be set to a member of an existing PDS/E
+
 
       | **required**: False
       | **type**: str
@@ -3444,6 +3446,8 @@ space_primary
 
   If this option is not set, the primary space is dynamically calculated based on the size of the generated CICS startup JCL.
 
+  If the target data set is a member in a PDS/E, then this value will not have any effect.
+
 
   | **required**: False
   | **type**: int
@@ -3457,6 +3461,8 @@ space_secondary
 
   If this option is not set, the secondary space is dynamically calculated as 10% of the total size of the generated CICS startup JCL.
 
+  If the target data set is a member in a PDS/E, then this value will not have any effect.
+
 
   | **required**: False
   | **type**: int
@@ -3472,6 +3478,8 @@ space_type
 
   If neither \ :literal:`space\_secondary`\  nor \ :literal:`space\_primary`\  is set, then this value does not have any effect.
 
+  If the target data set is a member in a PDS/E, then this value will not have any effect.
+
 
   | **required**: False
   | **type**: str
@@ -3527,6 +3535,8 @@ steplib
 volumes
   The volume(s) where the data set is created. Use a string to define a singular volume or a list of strings for multiple volumes.
 
+  If the target data set is a member in a PDS/E, then this value will not have any effect
+
 
   | **required**: False
   | **type**: raw

plugins/doc_fragments/region_jcl.py

@@ -19,6 +19,8 @@ class ModuleDocFragment(object):
         If the CICS startup JCL data set already exists, the option has no effect.
       - If this option is not set, the primary space is dynamically calculated based on the
         size of the generated CICS startup JCL.
+      - If the target data set is a member in a PDS/E, then this value will not have any
+        effect.
     type: int
     required: false
   space_secondary:
@@ -29,6 +31,8 @@ class ModuleDocFragment(object):
         If the CICS startup JCL data set already exists, the option has no effect.
       - If this option is not set, the secondary space is dynamically calculated as 10% of
         the total size of the generated CICS startup JCL.
+      - If the target data set is a member in a PDS/E, then this value will not have any
+        effect.
     type: int
     required: false
   space_type:
@@ -42,6 +46,8 @@ class ModuleDocFragment(object):
         cylinders (V(CYL)), or tracks (V(TRK)).
       - If neither O(space_secondary) nor O(space_primary) is set, then this value does
         not have any effect.
+      - If the target data set is a member in a PDS/E, then this value will not have any
+        effect.
     required: false
     type: str
     choices:
@@ -53,6 +59,8 @@ class ModuleDocFragment(object):
   volumes:
     description:
       - The volume(s) where the data set is created. Use a string to define a singular volume or a list of strings for multiple volumes.
+      - If the target data set is a member in a PDS/E, then this value will not have any
+        effect
     type: raw
     required: false
   state:
@@ -463,6 +471,7 @@ class ModuleDocFragment(object):
           dsn:
             description:
               - The data set name of the JCL data set to override the template.
+              - The data set name can also be set to a member of an existing PDS/E
             type: str
             required: false
   output_data_sets: