Update tunnel.rst

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@ -137,7 +137,7 @@ An example:
GRE-Bridge
^^^^^^^^^^
While normal GRE is for layer 3, GRE-Bridge is for layer 2. GRE-Bridge can encasulate Ethernet frames, thus it can be bridged with other interfaces to create datalink layer segments that span multiple remote sites.
While normal GRE is for layer 3, GRE-Bridge is for layer 2. GRE-Bridge can encapsulate Ethernet frames, thus it can be bridged with other interfaces to create datalink layer segments that span multiple remote sites.
Layer 2 GRE example: