leaflet: Document visible child functions

Document:
* hdy_leaflet_set_visible_child()
* hdy_leaflet_get_visible_child_name()
* hdy_leaflet_set_visible_child_name()

Signed-off-by: Alexander Mikhaylenko <alexm@gnome.org>
11 jobs for wip/exalm/leaflet-docs in 25 minutes and 42 seconds (queued for 9 minutes)
Status Job ID Name Coverage
  Build
passed #242287
librem5
api-visibility

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librem5
build-debian-clang

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librem5
build-debian-gcc

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librem5
build-fedora-gcc

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  Test+Docs
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librem5
build-gtkdoc

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librem5
unit-test

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43.7%
 
  Package
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librem5
package-debian-buster

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librem5:arm64
package-debian-buster:arm64

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failed #242295
flatpak allowed to fail
package-flatpak

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  Test Package
passed #242296
librem5
autopkgtest-debian-buster-package

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passed #242297
librem5
lintian-debian-buster-package

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Name Stage Failure
failed
package-flatpak Package
Committing stage finish to cache
Exporting sm.puri.Handy.Demo to repo
error: Writing content object: min-free-space-percent '3%' would be exceeded, at least 4.1?kB requested
Export failed: Child process exited with code 1
Uploading artifacts...
_build/meson-logs/meson-log.txt: found 1 matching files
WARNING: sm.puri.Handy.Demo-dev.flatpak: no matching files
Uploading artifacts to coordinator... ok
id=242295 responseStatus=201 Created token=Ss4WPUsX
ERROR: Job failed: exit code 1