Removed '&' from comment in 2019-12-12 blobs swagger (#8510)

Author: seanmcc-msft

specification/storage/data-plane/Microsoft.BlobStorage/preview/2019-12-12/blob.json

@@ -8338,7 +8338,7 @@
                 "x-ms-client-name": "ContentCrc64",
                 "type": "string",
                 "format": "byte",
-                "description": "If the request is to read a specified range and the x-ms-range-get-content-crc64 is set to true, then the request returns a crc64 for the range, as long as the range size is less than or equal to 4 MB. If both x-ms-range-get-content-crc64 & x-ms-range-get-content-md5 is specified in the same request, it will fail with 400(Bad Request)"
+                "description": "If the request is to read a specified range and the x-ms-range-get-content-crc64 is set to true, then the request returns a crc64 for the range, as long as the range size is less than or equal to 4 MB. If both x-ms-range-get-content-crc64 and x-ms-range-get-content-md5 is specified in the same request, it will fail with 400(Bad Request)"
               },
               "x-ms-copy-completion-time": {
                 "x-ms-client-name": "CopyCompletionTime",