fix typos in docs deprecation warnings

Author: displague

docs/src/data/endpoints/linodes.yaml

@@ -53,7 +53,7 @@ endpoints:
               The Distribution to deploy this Linode with.  May not be included
               if 'backup_id' or 'image' is sent.
             type: String
-            deprecated: This parameter will be deprecated once APIv4 out of beta. See changelog for more information.
+            deprecated: This parameter will be deprecated once APIv4 is out of beta. See the changelog for more information.
           root_pass:
             optional: unless source == "distro"
             description: >
@@ -197,7 +197,7 @@ endpoints:
               <ul><li>If no distribution is provided, a blank disk
               is created.</li></ul> You may not provide distribution if image is provided.
             type: String
-            deprecated: This parameter will be deprecated once APIv4 out of beta. See changelog for more information.
+            deprecated: This parameter will be deprecated once APIv4 is out of beta. See the changelog for more information.
           image:
             optional: true
             description: >
@@ -1015,7 +1015,7 @@ endpoints:
             description: >
                 An ID of a Distribution to deploy to this Linode.
             type: String
-            deprecated: This parameter will be deprecated once APIv4 out of beta. See changelog for more information.
+            deprecated: This parameter will be deprecated once APIv4 is out of beta. See the changelog for more information.
           image:
             optional: true
             description: >

docs/src/data/objects/linode.yaml

@@ -77,7 +77,7 @@ schema:
     type: Distribution
     seeAlso: "/reference/endpoints/linode/distributions"
     filterable: true
-    deprecated: This parameter will be deprecated once APIv4 out of beta. See changelog for more information.
+    deprecated: This parameter will be deprecated once APIv4 is out of beta. See the changelog for more information.
   group:
     editable: true
     type: String