Updated legal name description. Use Oxford comma (#357)

cmd/kosli/beginTrail.go

@@ -17,7 +17,7 @@ const beginTrailLongDesc = beginTrailShortDesc + `
 You can optionally associate the trail to a git commit using ^--commit^ (requires access to a git repo). And you  
 can optionally redact some of the git commit data sent to Kosli using ^--redact-commit-info^.
 
-A legal ^TRAIL-NAME^ must start with an alphanumeric and only contain alphanumeric characters, ^.^, ^-^, ^_^ and ^~^.
+^TRAIL-NAME^s must start with a letter or number, and only contain letters, numbers, ^.^, ^-^, ^_^, and ^~^.
 `
 
 const beginTrailExample = `

cmd/kosli/createEnvironment.go

@@ -38,7 +38,7 @@ Logical environments are used for grouping of physical environments. For instanc
 be grouped into logical environment **prod**. Logical environments are view-only, you can not report snapshots
 to them.
 
-A legal ^ENVIRONMENT-NAME^ must start with an alphanumeric and only contain alphanumeric characters, ^.^, ^-^, ^_^ and ^~^.
+^ENVIRONMENT-NAME^s must start with a letter or number, and only contain letters, numbers, ^.^, ^-^, ^_^, and ^~^.
 `
 
 const createEnvironmentExample = `

cmd/kosli/createFlow.go

@@ -18,7 +18,7 @@ const createFlowShortDesc = `Create or update a Kosli flow.`
 const createFlowLongDesc = createFlowShortDesc + `
 You can specify flow parameters in flags.
 
-A legal ^FLOW-NAME^ must start with an alphanumeric and only contain alphanumeric characters, ^.^, ^-^, ^_^ and ^~^.
+^FLOW-NAME^s must start with a letter or number, and only contain letters, numbers, ^.^, ^-^, ^_^, and ^~^.
 `
 
 const createFlowExample = `