Improve CaaS UI descriptions (#358)

* remove mention of home share from slurm-infra UI

* add description re. /project

Author: sjpb

environments/.caas/ui-meta/slurm-infra-fast-volume-type.yml

@@ -129,6 +129,15 @@ usage_template: |-
 
   SSH access can be granted to additional users by placing their SSH public key in `~azimuth/.ssh/authorized_keys`.
 
+  Note that home directories are deleted when the platform is destroyed.
+
+  If configured by the adminstrator, a project filesystem may be mounted at `/project`.
+  Content stored there will be available to all such configured workstations and Slurm
+  clusters, and will persist after deletion of workstations/clusters.
+
+  Other parts of the filesystem may be affected during a patch operation, including any
+  packages that have been installed using `dnf`.
+
 services:
   - name: ood
     label: Open OnDemand

environments/.caas/ui-meta/slurm-infra-manila-home.yml

@@ -5,8 +5,7 @@ description: >-
   Batch cluster running the Slurm workload manager, the Open 
   OnDemand web interface, and custom monitoring.
 
-  This version uses CephFS for home directories, deleted
-  when the platform is deleted.
+  This version uses CephFS for home directories.
 logo: https://upload.wikimedia.org/wikipedia/commons/thumb/3/3a/Slurm_logo.svg/158px-Slurm_logo.svg.png
 
 requires_ssh_key: true
@@ -120,6 +119,15 @@ usage_template: |-
 
   SSH access can be granted to additional users by placing their SSH public key in `~azimuth/.ssh/authorized_keys`.
 
+  Note that home directories are deleted when the platform is destroyed.
+
+  If configured by the adminstrator, a project filesystem may be mounted at `/project`.
+  Content stored there will be available to all such configured workstations and Slurm
+  clusters, and will persist after deletion of workstations/clusters.
+
+  Other parts of the filesystem may be affected during a patch operation, including any
+  packages that have been installed using `dnf`.
+
 services:
   - name: ood
     label: Open OnDemand

environments/.caas/ui-meta/slurm-infra.yml

@@ -52,7 +52,7 @@ parameters:
 
   - name: home_volume_size
     label: Home volume size (GB)
-    description: The size of the cloud volume or share to use for home directories.
+    description: The size of the cloud volume to use for home directories.
     kind: cloud.volume_size
     immutable: true
     options:
@@ -116,6 +116,15 @@ usage_template: |-
 
   SSH access can be granted to additional users by placing their SSH public key in `~azimuth/.ssh/authorized_keys`.
 
+  Note that home directories are deleted when the platform is destroyed.
+
+  If configured by the adminstrator, a project filesystem may be mounted at `/project`.
+  Content stored there will be available to all such configured workstations and Slurm
+  clusters, and will persist after deletion of workstations/clusters.
+
+  Other parts of the filesystem may be affected during a patch operation, including any
+  packages that have been installed using `dnf`.
+
 services:
   - name: ood
     label: Open OnDemand