docs(ru): add solution for HTTP/2 network errors on px4-autopilot clone

[belyaev-dev]

При слабой сети невозможно клонировать репозиторий PX4 - зависимости слетают с ошибкой сети
Летят ошибки подобного рода:

Cloning into '/Users/belyaev-dev/PX4-Autopilot/Tools/sitl_gazebo'...
error: RPC failed; curl 92 HTTP/2 stream 5 was not closed cleanly: CANCEL (err 8)
error: 8146 bytes of body are still expected
fetch-pack: unexpected disconnect while reading sideband packet
fatal: early EOF
fatal: fetch-pack: invalid index-pack output
fatal: clone of 'https://github.com/PX4/PX4-SITL_gazebo.git' into submodule path '/Users/belyaev-dev/PX4-Autopilot/Tools/sitl_gazebo' failed
Failed to clone 'Tools/sitl_gazebo'. Retry scheduled
Cloning into '/Users/belyaev-dev/PX4-Autopilot/platforms/nuttx/NuttX/nuttx'...
error: RPC failed; curl 92 HTTP/2 stream 5 was not closed cleanly: CANCEL (err 8)
error: 158 bytes of body are still expected
fetch-pack: unexpected disconnect while reading sideband packet
fatal: early EOF
fatal: fetch-pack: invalid index-pack output

Сборка, соответственно, не проходит:

CMake Error at /opt/ros/noetic/share/catkin/cmake/catkin_workspace.cmake:100 (message):
  This workspace contains non-catkin packages in it, and catkin cannot build
  a non-homogeneous workspace without isolation.  Try the
  'catkin_make_isolated' command instead.
Call Stack (most recent call first):
  CMakeLists.txt:69 (catkin_workspace)


-- Configuring incomplete, errors occurred!
See also "/home/clover/catkin_ws/build/CMakeFiles/CMakeOutput.log".
See also "/home/clover/catkin_ws/build/CMakeFiles/CMakeError.log".
make: *** [Makefile:320: cmake_check_build_system] Ошибка 1
Invoking "make cmake_check_build_system" failed

[okalachev]

Здравствуйте, @belyaev-dev, спасибо за pull request!

Дайте мне возможность редактировать вашу ветку (Allow edits from maintainers), чтобы я исправил проблему с Markdownlint.

[belyaev-dev]

@okalachev добрый день! Уже стоит с создания PR.

Выдал дополнительно приглашение в форк в качестве коллаборатора