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Tidy section of README on targeting machines

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Original file line number	Diff line number	Diff line change
`@@ -35,26 +35,26 @@ And execute against an environment and set of hosts like so:`
`35`	`35`	`$ fab preview class:frontend do:'uname -a'`
`36`	`36`	`...`
`37`	`37`
`38`		`-##Targetting groups of machines`
	`38`	`+##Targeting groups of machines`
`39`	`39`
`40`	`40`	`Fabric tasks can be run on groups of machines in a variety of different ways.`
`41`	`41`
`42`		`-by puppet class`
	`42`	`+By Puppet class:`
`43`	`43`
`44`	`44`	`# target all machines that have the 'govuk::safe_to_reboot::yes' class`
`45`	`45`	`$ fab preview puppet_class:govuk::safe_to_reboot::yes do:'uname -a'`
`46`	`46`
`47`		`-by numeric machine suffix`
	`47`	`+By numeric machine suffix:`
`48`	`48`
`49`	`49`	`# target all machines that end in '2'`
`50`	`50`	`$ fab preview numbered:2 do:'uname -a'`
`51`	`51`
`52`		`-by node type (as defined inpuppet)`
	`52`	`+By node type (as defined inPuppet):`
`53`	`53`
`54`	`54`	`# target all 'frontend' machines`
`55`	`55`	`$ fab preview node_type:frontend do:'uname -a'`
`56`	`56`
`57`		`-by the node name`
	`57`	`+By the node name:`
`58`	`58`
`59`	`59`	`# target just one node`
`60`	`60`	`$ fab production -H backend-3.backend do:'uname -a'`

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