Add docs

Signed-off-by: Simeon Widdis <[email protected]>

Author: Swiddis

docs/user/ppl/cmd/head.rst

@@ -19,6 +19,7 @@ Syntax
 head [<size>] [from <offset>]
 
 * <size>: optional integer. number of results to return. **Default:** 10
+  * For readability or convenience, this can be prefixed by `limit=`.
 * <offset>: integer after optional ``from``. number of results to skip. **Default:** 0
 
 Example 1: Get first 10 results

docs/user/ppl/cmd/top.rst

@@ -21,6 +21,7 @@ top [N] <field-list> [by-clause]
 top [N] <field-list> [top-options] [by-clause] ``(available from 3.1.0+)``
 
 * N: number of results to return. **Default**: 10
+  * For readability or convenience, this can be prefixed by `limit=`.
 * field-list: mandatory. comma-delimited list of field names.
 * by-clause: optional. one or more fields to group the results by.
 * top-options: optional. options for the top command. Supported syntax is [countfield=<string>] [showcount=<bool>].