updated help text for install --atomic, which was completely inaccurate (#7912)

Signed-off-by: Matt Butcher <matt.butcher@microsoft.com>

cmd/helm/install.go

@@ -148,7 +148,7 @@ func addInstallFlags(f *pflag.FlagSet, client *action.Install, valueOpts *values
 	f.BoolVar(&client.Devel, "devel", false, "use development versions, too. Equivalent to version '>0.0.0-0'. If --version is set, this is ignored")
 	f.BoolVar(&client.DependencyUpdate, "dependency-update", false, "run helm dependency update before installing the chart")
 	f.BoolVar(&client.DisableOpenAPIValidation, "disable-openapi-validation", false, "if set, the installation process will not validate rendered templates against the Kubernetes OpenAPI Schema")
-	f.BoolVar(&client.Atomic, "atomic", false, "if set, installation process purges chart on fail. The --wait flag will be set automatically if --atomic is used")
+	f.BoolVar(&client.Atomic, "atomic", false, "if set, the installation process deletes the installation on failure. The --wait flag will be set automatically if --atomic is used")
 	f.BoolVar(&client.SkipCRDs, "skip-crds", false, "if set, no CRDs will be installed. By default, CRDs are installed if not already present")
 	f.BoolVar(&client.SubNotes, "render-subchart-notes", false, "if set, render subchart notes along with the parent")
 	addValueOptionsFlags(f, valueOpts)