Possibly typo: documentation of inv() of SE2

[amiryanj]

I think, in the example the first variable should be T instead of T^{-1}:
https://github.com/petercorke/spatialmath-python/blob/140d499e733ed9775762df90d36e4b2c4c2fc6eb/spatialmath/pose2d.py#L515

[petercorke]

thx, included now