Update language on search usage

This is a followup to PR #6780 that implements some discussed
language changes.
Signed-off-by: Matt Farina <matt@mattfarina.com>

cmd/helm/search.go

@@ -46,7 +46,7 @@ Examples:
     # Search for release versions matching the keyword "nginx", including pre-release versions
     helm search nginx --devel
 
-    # Search for the latest patch release for nginx-ingress 1.x
+    # Search for the latest stable release for nginx-ingress with a major version of 1
     helm search nginx-ingress --version ^1.0.0
 
 Repositories are managed with 'helm repo' commands.

docs/helm/helm_search.md

@@ -20,7 +20,7 @@ Examples:
     # Search for release versions matching the keyword "nginx", including pre-release versions
     helm search nginx --devel
 
-    # Search for the latest patch release for nginx-ingress 1.x
+    # Search for the latest stable release for nginx-ingress with a major version of 1
     helm search nginx-ingress --version ^1.0.0
 
 Repositories are managed with 'helm repo' commands.
@@ -73,4 +73,4 @@ helm search [keyword] [flags]
 
 * [helm](helm.md)	 - The Helm package manager for Kubernetes.
 
-###### Auto generated by spf13/cobra on 25-Oct-2019
+###### Auto generated by spf13/cobra on 30-Oct-2019