doc: Fix some docstrings

16 jobs for hotdoc in 74 minutes and 14 seconds (queued for 11 seconds)
Status Job ID Name Coverage
  Preparation
passed #295858
gst indent

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passed #295846
manifest

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  Build
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build fedora x86_64

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passed #295874
build nodebug fedora x86_64

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  Test
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check fedora

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passed #296040
integration testsuites fedora

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failed #296016
integration testsuites fedora

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failed #295903
integration testsuites fedora

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  Full Builds
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build cerbero android universal

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passed #295931
build cerbero cross win32

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passed #295936
build cerbero cross win64

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passed #295917
build cerbero fedora x86_64

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  Full Tests
passed #295952
valgrind bad

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passed #295956
valgrind ges

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passed #295944
valgrind good

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  Apps
passed #295962
android universal examples

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