HDFS-8866. Typo in docs: Rumtime -> Runtime. Contributed by Gabor Liptak.

hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt

@@ -1118,6 +1118,8 @@ Release 2.8.0 - UNRELEASED
     HDFS-8844. TestHDFSCLI does not cleanup the test directory (Masatake
     Iwasaki via Colin P. McCabe)
 
+    HDFS-8866. Typo in docs: Rumtime -> Runtime. (Gabor Liptak via jghoman)
+
 Release 2.7.2 - UNRELEASED
 
   INCOMPATIBLE CHANGES

hadoop-hdfs-project/hadoop-hdfs/src/site/markdown/WebHDFS.md

@@ -1002,7 +1002,7 @@ When an operation fails, the server may throw an exception. The JSON schema of e
 | `SecurityException ` | `401 Unauthorized ` |
 | `IOException ` | `403 Forbidden ` |
 | `FileNotFoundException ` | `404 Not Found ` |
-| `RumtimeException ` | `500 Internal Server Error` |
+| `RuntimeException ` | `500 Internal Server Error` |
 
 Below are examples of exception responses.