Fix ExternalSecret key in documentation (#2105)

* Fix ExternalSecret key in documentation

Signed-off-by: Šimon Mišenčík <simon.misencik@gmail.com>

* Add comment into snippsets

Signed-off-by: Simon Misencik <simon.misencik@gmail.com>

---------

Signed-off-by: Šimon Mišenčík <simon.misencik@gmail.com>
Signed-off-by: Simon Misencik <simon.misencik@gmail.com>

docs/provider/hashicorp-vault.md

@@ -70,7 +70,7 @@ spec:
   data:
   - secretKey: foobar
     remoteRef:
-      key: secret/foo
+      key: foo
       property: my-value
 ---
 # will create a secret with:

docs/snippets/full-cluster-secret-store.yaml

@@ -40,6 +40,7 @@ spec:
     vault:
       server: "https://vault.acme.org"
       # Path is the mount path of the Vault KV backend endpoint
+      # Used as a path prefix for the external secret key
       path: "secret"
       # Version is the Vault KV secret engine version.
       # This can be either "v1" or "v2", defaults to "v2"

docs/snippets/full-secret-store.yaml

@@ -45,6 +45,7 @@ spec:
     vault:
       server: "https://vault.acme.org"
       # Path is the mount path of the Vault KV backend endpoint
+      # Used as a path prefix for the external secret key
       path: "secret"
       # Version is the Vault KV secret engine version.
       # This can be either "v1" or "v2", defaults to "v2"