Clarify wording in the description of Multi-node deployment.
Clarify wording in the description of Multi-node deployment.

Change-Id: I0d978898334987cada7eaf3e257d3b0ae60de892

ogelbukh/fuel-docs,ogelbukh/fuel-docs,ogelbukh/fuel-docs,phillipsio/fuel-docs,phillipsio/fuel-docs,stackforge/fuel-docs,phillipsio/fuel-docs,phillipsio/fuel-docs,stackforge/fuel-docs,ogelbukh/fuel-docs