Doc : fix typo in "Installation from tarball"

[nqb]

Hello,

On https://ltb-project.org/documentation/white-pages/latest/install_tarball page, we can read :

You should have installed these programs before running Self Service Password:

We should read :

You should have installed these programs before running White Pages :

Self Service Password need to be replace by White Pages.

[coudot]

Thanks for the report, it is now fixed.