Add api documention to bus_transaction_new() and bus_transaction_free()

11 jobs for bus_transaction_xxx-docs in 8 minutes and 47 seconds (queued for 1 second)
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passed #2818492
build:cmake

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build:debug

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manual #2818494
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build:i686-w64-mingw32-cmake
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build:i686-w64-mingw32-debug

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manual #2818491
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build:legacy
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build:production

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manual #2818490
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build:reduced
manual #2818497
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build:stretch
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build:x86_64-w64-mingw32

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passed #2818496
build:x86_64-w64-mingw32-cmake-debug

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manual #2818498
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build:xenial