Align exec documentation with v0.10 updates

plugins/inputs/exec/README.md

@@ -7,13 +7,13 @@ For example, if you have a json-returning command called mycollector, you could
 setup the exec plugin with:
 
 ```
-[[exec.commands]]
-command = "/usr/bin/mycollector --output=json"
-name = "mycollector"
-interval = 10
+[[inputs.exec]]
+  command = "/usr/bin/mycollector --output=json"
+  name_suffix = "_mycollector"
+  interval = 10
 ```
 
-The name is used as a prefix for the measurements.
+The name suffix is appended to exec as "exec_name_suffix" to identify the input stream.
 
 The interval is used to determine how often a particular command should be run. Each
 time the exec plugin runs, it will only run a particular command if it has been at least
@@ -22,7 +22,7 @@ time the exec plugin runs, it will only run a particular command if it has been
 
 # Sample
 
-Let's say that we have a command named "mycollector", which gives the following output:
+Let's say that we have a command with the name_suffix "_mycollector", which gives the following output:
 ```json
 {
     "a": 0.5,
@@ -34,9 +34,7 @@ Let's say that we have a command named "mycollector", which gives the following
 }
 ```
 
-The collected metrics will be:
+The collected metrics will be stored as field values under the same measurement "exec_mycollector":
 ```
-exec_mycollector_a value=0.5
-exec_mycollector_b_d value=0.1
-exec_mycollector_b_e value=5
+ exec_mycollector a=0.5,b_c="some text",b_d=0.1,b_e=5 1452815002357578567
 ```