Copy docs into Zeek repo directly

This is based on commit 2731def9159247e6da8a3191783c89683363689c from the
zeek-docs repo.

doc/scripts/base/packet-protocols/vxlan/__load__.zeek.rst

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+:tocdepth: 3
+
+base/packet-protocols/vxlan/__load__.zeek
+=========================================
+
+
+:Imports: :doc:`base/packet-protocols/vxlan/main.zeek </scripts/base/packet-protocols/vxlan/main.zeek>`
+
+Summary
+~~~~~~~
+
+Detailed Interface
+~~~~~~~~~~~~~~~~~~
+

doc/scripts/base/packet-protocols/vxlan/index.rst

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+:orphan:
+
+Package: base/packet-protocols/vxlan
+====================================
+
+
+:doc:`/scripts/base/packet-protocols/vxlan/__load__.zeek`
+
+
+:doc:`/scripts/base/packet-protocols/vxlan/main.zeek`
+
+

doc/scripts/base/packet-protocols/vxlan/main.zeek.rst

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+:tocdepth: 3
+
+base/packet-protocols/vxlan/main.zeek
+=====================================
+.. zeek:namespace:: PacketAnalyzer::VXLAN
+
+
+:Namespace: PacketAnalyzer::VXLAN
+
+Summary
+~~~~~~~
+Redefinable Options
+###################
+======================================================================================================== ============================================
+:zeek:id:`PacketAnalyzer::VXLAN::default_analyzer`: :zeek:type:`PacketAnalyzer::Tag` :zeek:attr:`&redef` 
+:zeek:id:`PacketAnalyzer::VXLAN::vxlan_ports`: :zeek:type:`set` :zeek:attr:`&redef`                      The set of UDP ports used for VXLAN traffic.
+======================================================================================================== ============================================
+
+Redefinitions
+#############
+==================================================================== =
+:zeek:id:`likely_server_ports`: :zeek:type:`set` :zeek:attr:`&redef` 
+==================================================================== =
+
+
+Detailed Interface
+~~~~~~~~~~~~~~~~~~
+Redefinable Options
+###################
+.. zeek:id:: PacketAnalyzer::VXLAN::default_analyzer
+   :source-code: base/packet-protocols/vxlan/main.zeek 6 6
+
+   :Type: :zeek:type:`PacketAnalyzer::Tag`
+   :Attributes: :zeek:attr:`&redef`
+   :Default: ``PacketAnalyzer::ANALYZER_ETHERNET``
+
+
+.. zeek:id:: PacketAnalyzer::VXLAN::vxlan_ports
+   :source-code: base/packet-protocols/vxlan/main.zeek 12 12
+
+   :Type: :zeek:type:`set` [:zeek:type:`port`]
+   :Attributes: :zeek:attr:`&redef`
+   :Default:
+
+      ::
+
+         {
+            4789/udp
+         }
+
+
+   The set of UDP ports used for VXLAN traffic.  Traffic using this
+   UDP destination port will attempt to be decapsulated.  Note that if
+   if you customize this, you may still want to manually ensure that
+   :zeek:see:`likely_server_ports` also gets populated accordingly.
+
+