Various improvements

- UP4 architecture now includes PFCP agent as part of SD-Fabric
- Update UP4 troubleshooting commands

Change-Id: I46cf9eef751e3d217a0398e73969b52ee277c02f
diff --git a/images/up4-arch.png b/images/up4-arch.png
index dc7a85b..b2e59a6 100644
--- a/images/up4-arch.png
+++ b/images/up4-arch.png
Binary files differ
diff --git a/troubleshooting.rst b/troubleshooting.rst
index a0c97c1..5169dc3 100644
--- a/troubleshooting.rst
+++ b/troubleshooting.rst
@@ -316,31 +316,30 @@
 
 ONOS basics
 """""""""""
-- `flows`: List flow tables. `-s` for simplified output.
-- `groups`: List group tables. `-s` for simplified output.
-- `devices`: List device information. `-s` for simplified output.
-- `ports`: List port information. `-e` to list enabled ports only.
-- `links`: List discovered links
-- `hosts`: List discovered hosts. `-s` for simplified output.
-- `netcfg`: List network configuration
-- `interfaces`: List interface configuration
+- ``flows``: List flow tables. `-s` for simplified output.
+- ``groups``: List group tables. `-s` for simplified output.
+- ``devices``: List device information. `-s` for simplified output.
+- ``ports``: List port information. `-e` to list enabled ports only.
+- ``links``: List discovered links
+- ``hosts``: List discovered hosts. `-s` for simplified output.
+- ``netcfg``: List network configuration
+- ``interfaces``: List interface configuration
 
 trellis-control
 """""""""""""""
-- `sr-pr-list`: List current recovery phase of each device
-- `sr-device-subnets`: List device-subnet mapping
+- ``sr-pr-list``: List current recovery phase of each device
+- ``sr-device-subnets``: List device-subnet mapping
 
 fabric-tna
 """"""""""
-- `slices`: List network slices
-- `tcs`: List traffic classes of given slice
+- ``slices``: List network slices
+- ``tcs``: List traffic classes of given slice
 
 up4
 """
-- `read-interfaces`: List all interfaces installed in the data plane
-- `read-pdrs`: List all PDRs installed in the data plane
-- `read-fars`: List all FARS installed in the data plane
-- `read-flows`: List all UE data flows installed in the data plane)
+- ``read-entities -a``: Print UPF entities installed in the UPF dataplane.
+  More options are available. See ``read-entities --help``
+
 
 Stratum
 ^^^^^^^
@@ -354,4 +353,4 @@
 
 BF Shell
 """"""""
-- `pm.show`: List port configurations. `-a` to list all ports.
+- ``pm.show``: List port configurations. `-a` to list all ports.