examples/health: fix markdown formatting and improve content (#8625)

This PR fixes some markdown formatting issues flagged by an internal
tool (when attempting to import recent changes into google3). It also
makes minor improvements to the content.

RELEASE NOTES: N/A

Author: easwars

examples/features/health/README.md

@@ -1,10 +1,13 @@
 # Health
 
-gRPC provides a health library to communicate a system's health to their clients.
-It works by providing a service definition via the [health/v1](https://github.com/grpc/grpc-proto/blob/master/grpc/health/v1/health.proto) api.
+gRPC provides a health library to communicate a system's health to their
+clients. It works by providing a service definition via the
+[health/v1](https://github.com/grpc/grpc-proto/blob/master/grpc/health/v1/health.proto)
+api.
 
-By using the health library, clients can gracefully avoid using servers as they encounter issues.
-Most languages provide an implementation out of box, making it interoperable between systems.
+Clients use the health library to gracefully avoid servers that encounter
+issues. Most languages provide an out-of-box implementation, which makes it
+interoperable between systems.
 
 ## Try it
 
@@ -21,13 +24,17 @@ go run client/main.go
 
 ### Client
 
-Clients have two ways to monitor a servers health.
-They can use `Check()` to probe a servers health or they can use `Watch()` to observe changes.
+Clients have two ways to monitor a server's health. They use `Check()` to probe
+a server's health or `Watch()` to observe changes.
 
-In most cases, clients do not need to directly check backend servers.
-Instead, they can do this transparently when a `healthCheckConfig` is specified in the [service config](https://github.com/grpc/proposal/blob/master/A17-client-side-health-checking.md#service-config-changes) and the [health package](https://pkg.go.dev/google.golang.org/grpc/health) is imported.
-The `serviceName` in `healthCheckConfig` will be used in the health check when connections are established.
-An empty string (`""`) typically indicates the overall health of a server should be reported.
+In most cases, clients do not directly check backend servers. Instead, they do
+this transparently when you specify a `healthCheckConfig` in the [service
+config](https://github.com/grpc/proposal/blob/master/A17-client-side-health-checking.md#service-config-changes)
+and import the [health
+package](https://pkg.go.dev/google.golang.org/grpc/health). The `serviceName` in
+`healthCheckConfig` is used in the health check when connections are
+established. An empty string (`""`) typically indicates the overall health of a
+server.
 
 ```go
 // import grpc/health to enable transparent client side checking
@@ -43,21 +50,25 @@ serviceConfig := grpc.WithDefaultServiceConfig(`{
 conn, err := grpc.NewClient(..., serviceConfig)
 ```
 
-See [A17 - Client-Side Health Checking](https://github.com/grpc/proposal/blob/master/A17-client-side-health-checking.md) for more details.
+See [A17 - Client-Side Health
+Checking](https://github.com/grpc/proposal/blob/master/A17-client-side-health-checking.md)
+for more details.
 
 ### Server
 
-Servers control their serving status.
-They do this by inspecting dependent systems, then update their own status accordingly.
-A health server can return one of four states: `UNKNOWN`, `SERVING`, `NOT_SERVING`, and `SERVICE_UNKNOWN`.
+Servers control their serving status. They do this by inspecting dependent
+systems, then update their status accordingly. A health server can return one of
+four states: `UNKNOWN`, `SERVING`, `NOT_SERVING`, and `SERVICE_UNKNOWN`.
 
-`UNKNOWN` indicates the current state is not yet known.
-This state is often seen at the start up of a server instance.
+`UNKNOWN` indicates the system does not yet know the current state. Servers
+often show this state at startup.
 
 `SERVING` means that the system is healthy and ready to service requests.
-Conversely, `NOT_SERVING` indicates the system is unable to service requests at the time.
+Conversely, `NOT_SERVING` indicates the system is unable to service requests at
+the time.
 
-`SERVICE_UNKNOWN` communicates the `serviceName` requested by the client is not known by the server.
-This status is only reported by the `Watch()` call.
+`SERVICE_UNKNOWN` communicates the `serviceName` requested by the client is not
+known by the server. This status is only reported by the `Watch()` call.
 
-A server may toggle its health using `healthServer.SetServingStatus("serviceName", servingStatus)`.
+A server may toggle its health using
+`healthServer.SetServingStatus("serviceName", servingStatus)`.