Fix version number format in nodes.info.yaml

Signed-off-by: hye-on <[email protected]>

Author: hye-on

spec/schemas/nodes.info.yaml

@@ -68,15 +68,15 @@ components:
           description: Total heap allowed to be used to hold recently indexed documents before they must be written to disk. This size is a shared pool across all shards on this node, and is controlled by Indexing Buffer settings.
           oneOf:
             - $ref: '_common.yaml#/components/schemas/ByteCount'
-              x-version-removed: 3.0
+              x-version-removed: '3.0'
             - $ref: '_common.yaml#/components/schemas/HumanReadableByteCount'
-              x-version-added: 3.0
+              x-version-added: '3.0'
         total_indexing_buffer_in_bytes:
           oneOf:
             - $ref: '_common.yaml#/components/schemas/HumanReadableByteCount'
-              x-version-removed: 3.0
+              x-version-removed: '3.0'
             - $ref: '_common.yaml#/components/schemas/ByteCount'
-              x-version-added: 3.0
+              x-version-added: '3.0'
         transport:
           $ref: '#/components/schemas/NodeInfoTransport'
         transport_address: