Add in-form help text for Media Use field on the four standard media types (#150)

* Update field.field.media.image.field_media_use.yml

* Update field.field.media.audio.field_media_use.yml

* Update field.field.media.file.field_media_use.yml

* Update field.field.media.video.field_media_use.yml

modules/islandora_core_feature/config/install/field.field.media.audio.field_media_use.yml

@@ -10,7 +10,7 @@ field_name: field_media_use
 entity_type: media
 bundle: audio
 label: 'Media Use'
-description: ''
+description: 'Defined by Portland Common Data Model: Use Extension https://pcdm.org/2015/05/12/use. ''Original File'' will trigger creation of derivatives.'
 required: false
 translatable: false
 default_value: {  }

modules/islandora_core_feature/config/install/field.field.media.file.field_media_use.yml

@@ -10,7 +10,7 @@ field_name: field_media_use
 entity_type: media
 bundle: file
 label: 'Media Use'
-description: ''
+description: 'Defined by Portland Common Data Model: Use Extension https://pcdm.org/2015/05/12/use. ''Original File'' will trigger creation of derivatives.'
 required: false
 translatable: true
 default_value: {  }

modules/islandora_core_feature/config/install/field.field.media.image.field_media_use.yml

@@ -10,7 +10,7 @@ field_name: field_media_use
 entity_type: media
 bundle: image
 label: 'Media Use'
-description: ''
+description: 'Defined by Portland Common Data Model: Use Extension https://pcdm.org/2015/05/12/use. ''Original File'' will trigger creation of derivatives.'
 required: false
 translatable: true
 default_value: {  }

modules/islandora_core_feature/config/install/field.field.media.video.field_media_use.yml

@@ -10,7 +10,7 @@ field_name: field_media_use
 entity_type: media
 bundle: video
 label: 'Media Use'
-description: ''
+description: 'Defined by Portland Common Data Model: Use Extension https://pcdm.org/2015/05/12/use. ''Original File'' will trigger creation of derivatives.'
 required: false
 translatable: true
 default_value: {  }