[readme][prerelease] Add limitation note for PRERELEASE_REPONAME variable.
[readme][prerelease] Add limitation note for PRERELEASE_REPONAME variable.

geoffreychiou/industrial_ci,tecnalia-advancedmanufacturing-robotics/industrial_ci,geoffreychiou/industrial_ci,tecnalia-advancedmanufacturing-robotics/industrial_ci,ros-industrial/industrial_ci,tecnalia-advancedmanufacturing-robotics/industrial_ci,ros-industrial/industrial_ci,ros-industrial/industrial_ci