Fix documentation for trim cmd

Update '--id' to '--trim-id' to match the actual option name.

Change-Id: Ife39a903d2221f41d7c1054b900b46936bc6e9e3

src/main/resources/Documentation/cmd-trim.md

diff --git a/src/main/resources/Documentation/cmd-trim.md b/src/main/resources/Documentation/cmd-trim.md
index 35ab609..f092b29 100644
--- a/src/main/resources/Documentation/cmd-trim.md
+++ b/src/main/resources/Documentation/cmd-trim.md
@@ -9,7 +9,7 @@
 --------
 ```
 ssh -p @SSH_PORT@ @SSH_HOST@ @PLUGIN@ trim
-   [--id] <TRIM_ID>
+   [--trim-id] <TRIM_ID>
    [--size] <SIZE>
 ```