[docs] switch gl_handle+gl_target docs for cogl_texture_new_from_foreign
[docs] switch gl_handle+gl_target docs for cogl_texture_new_from_foreign

The descriptions for gl_handle and gl_target were inverted.

Thanks to Young-Ho Cha for spotting that.

Signed-off-by: Robert Bragg <12e9293ec6b30c7fa8a0926af42807e929c1684f@linux.intel.com>

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