Fixing nits of ironic-ui Readme.rst
Fixing nits of ironic-ui Readme.rst

Removed whitespaces from the document and
earlier Horizon installation link was giving
404 because of presence of whitespace, this
patch fixed that.

Change-Id: Id02665f0d8741b403ea44dedd596eae66715fde4

openstack/ironic-ui,openstack/ironic-ui,openstack/ironic-ui,openstack/ironic-ui