docs: Correct header level for log/limiting parameters

Change-Id: Ibfeb4736ab5379fed38ca6f6799e3d8bd8bfbea4

Documentation/api-reference.md

diff --git a/Documentation/api-reference.md b/Documentation/api-reference.md
index 837712e..c95d9c4 100644
--- a/Documentation/api-reference.md
+++ b/Documentation/api-reference.md
@@ -31,7 +31,7 @@
 * `committer=<name or email>`
 * `grep=<pattern>`
 
-#### Limit and Paging parameters
+##### Limit and Paging parameters
 * `n=<number>` to limit the number of commits returned.
 * `s=<start_number>` to set start during paging.
    The `next` key in the JSON response provides a cursor for the next page.