docs: override rtp and rtsp library project name

To avoid conflicts with the rtp and rtsp plugins

Fixes: #606
17 jobs for fix-docs-library-name in 84 minutes and 56 seconds (queued for 24 seconds)
latest
Status Job ID Name Coverage
  Preparation
passed #336485
gst indent

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manifest

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  Build
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build fedora x86_64

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build nodebug fedora x86_64

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build static fedora x86_64

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build static nodebug fedora x86_64

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  Test
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check fedora

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integration testsuites fedora

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  Full Builds
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build cerbero android universal

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build cerbero cross win32

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build cerbero cross win64

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passed #336492
build cerbero fedora x86_64

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  Full Tests
passed #336497
valgrind bad

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passed #336498
valgrind ges

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passed #336496
valgrind good

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  Apps
passed #336499
android universal examples

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  Deploy
passed #336500
documentation

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