[zanata/zanata-client] 3cdd04: Update manual-installation.md to fix symlinking

[GitHub]

  Branch: refs/heads/release
  Home:   https://github.com/zanata/zanata-client
  Commit: 3cdd0449bb798e9019d77bfee0427cc1913ed2f9
      https://github.com/zanata/zanata-client/commit/3cdd0449bb798e9019d77bfee0427cc1913ed2f9
  Author: pixelrust <pixelrust at users.noreply.github.com>
  Date:   2016-02-23 (Tue, 23 Feb 2016)

  Changed paths:
    M docs/installation/manual-installation.md

  Log Message:
  -----------
  Update manual-installation.md to fix symlinking

Added --relative option to instructions for symbolic linking.
ln needs this option to create working symbolic links when a non-absolute target path is provided, as in the current examples.