Document that public_exponent applies only to MHSM (Azure#21762)

Author: chlowell

specification/keyvault/data-plane/Microsoft.KeyVault/preview/7.2-preview/keys.json

@@ -1373,7 +1373,7 @@
         "public_exponent": {
           "type": "integer",
           "format": "int32",
-          "description": "The public exponent for a RSA key."
+          "description": "The public exponent for a RSA key. This applies only to keys created in a Managed HSM."
         },
         "key_ops": {
           "type": "array",

specification/keyvault/data-plane/Microsoft.KeyVault/preview/7.3-preview/keys.json

@@ -1662,7 +1662,7 @@
         "public_exponent": {
           "type": "integer",
           "format": "int32",
-          "description": "The public exponent for a RSA key."
+          "description": "The public exponent for a RSA key. This applies only to keys created in a Managed HSM."
         },
         "key_ops": {
           "type": "array",

specification/keyvault/data-plane/Microsoft.KeyVault/preview/7.4-preview.1/keys.json

@@ -1683,7 +1683,7 @@
         "public_exponent": {
           "type": "integer",
           "format": "int32",
-          "description": "The public exponent for a RSA key."
+          "description": "The public exponent for a RSA key. This applies only to keys created in a Managed HSM."
         },
         "key_ops": {
           "type": "array",

specification/keyvault/data-plane/Microsoft.KeyVault/stable/7.2/keys.json

@@ -1373,7 +1373,7 @@
         "public_exponent": {
           "type": "integer",
           "format": "int32",
-          "description": "The public exponent for a RSA key."
+          "description": "The public exponent for a RSA key. This applies only to keys created in a Managed HSM."
         },
         "key_ops": {
           "type": "array",

specification/keyvault/data-plane/Microsoft.KeyVault/stable/7.3/keys.json

@@ -1663,7 +1663,7 @@
         "public_exponent": {
           "type": "integer",
           "format": "int32",
-          "description": "The public exponent for a RSA key."
+          "description": "The public exponent for a RSA key. This applies only to keys created in a Managed HSM."
         },
         "key_ops": {
           "type": "array",