Use '2g' when referring to 2 Gigabytes of streamFileThreshold

In the documentation, use the 'g' unit for referring to the
2 GigaBytes limit of the streamFileThreshold setting.

Change-Id: I9a3f7dd9efc4e50ab2d44c6a082cc6e09f8d0612
diff --git a/Documentation/config-gerrit.txt b/Documentation/config-gerrit.txt
index 57694e9..53d976f 100644
--- a/Documentation/config-gerrit.txt
+++ b/Documentation/config-gerrit.txt
@@ -1617,7 +1617,7 @@
 when handling very big binary files, such as device firmware or
 CD-ROM ISO images.
 +
-Defaults to 25% of the available JVM heap, limited to 2048m.
+Defaults to 25% of the available JVM heap, limited to 2g.
 +
 Common unit suffixes of 'k', 'm', or 'g' are supported.