[PATCH v3 1/5] doc: fix blank lines in modify field action description

[Michael Baum <michaelba@nvidia.com>]

The modify field action description inside "Generic flow API (rte_flow)"
documentation, lists all operations supported for a destination field.
In addition, it lists the values supported for a encapsulation level
field.

Before the lists, in both cases, miss a blank line causing them to look
regular text lines.

This patch adds the blank lines.

Fixes: 73b68f4c54a0 ("ethdev: introduce generic modify flow action")
Cc: akozyrev@nvidia.com
Cc: stable@dpdk.org

Signed-off-by: Michael Baum <michaelba@nvidia.com>
---
 doc/guides/prog_guide/rte_flow.rst | 15 +++++++++------
 1 file changed, 9 insertions(+), 6 deletions(-)

diff --git a/doc/guides/prog_guide/rte_flow.rst b/doc/guides/prog_guide/rte_flow.rst
index 32fc45516a..e7faa368a1 100644
--- a/doc/guides/prog_guide/rte_flow.rst
+++ b/doc/guides/prog_guide/rte_flow.rst
@@ -2917,20 +2917,23 @@ The immediate value ``RTE_FLOW_FIELD_VALUE`` (or a pointer to it
 ``RTE_FLOW_FIELD_START`` is used to point to the beginning of a packet.
 See ``enum rte_flow_field_id`` for the list of supported fields.
 
-``op`` selects the operation to perform on a destination field.
+``op`` selects the operation to perform on a destination field:
+
 - ``set`` copies the data from ``src`` field to ``dst`` field.
 - ``add`` adds together ``dst`` and ``src`` and stores the result into ``dst``.
-- ``sub`` subtracts ``src`` from ``dst`` and stores the result into ``dst``
+- ``sub`` subtracts ``src`` from ``dst`` and stores the result into ``dst``.
 
 ``width`` defines a number of bits to use from ``src`` field.
 
 ``level`` is used to access any packet field on any encapsulation level
-as well as any tag element in the tag array.
-- ``0`` means the default behaviour. Depending on the packet type, it can
-mean outermost, innermost or anything in between.
+as well as any tag element in the tag array:
+
+- ``0`` means the default behaviour. Depending on the packet type,
+  it can mean outermost, innermost or anything in between.
 - ``1`` requests access to the outermost packet encapsulation level.
 - ``2`` and subsequent values requests access to the specified packet
-encapsulation level, from outermost to innermost (lower to higher values).
+  encapsulation level, from outermost to innermost (lower to higher values).
+
 For the tag array (in case of multiple tags are supported and present)
 ``level`` translates directly into the array index.
 
-- 
2.25.1