docs(graphql-instrumentation): add documentation for ignoreResolveSpans (#1912)

Author: satazor

plugins/node/opentelemetry-instrumentation-graphql/README.md

@@ -43,6 +43,7 @@ registerInstrumentations({
       // depth: 2,
       // mergeItems: true,
       // ignoreTrivialResolveSpans: true,
+      // ignoreResolveSpans: true,
     }),
   ],
 });
@@ -57,6 +58,7 @@ registerInstrumentations({
 |    depth    |  number |       -1      |                       The maximum depth of fields/resolvers to instrument. When set to 0 it will not instrument fields and resolvers. When set to -1 it will instrument all fields and resolvers.                      |   |
 | allowValues | boolean |     false     | When set to true it will not remove attributes values from schema source.   By default all values that can be sensitive are removed and replaced with "*" |   |
 | ignoreTrivialResolveSpans | boolean | false | Don't create spans for the execution of the default resolver on object properties. |
+| ignoreResolveSpans | boolean | false | Don't create spans for resolvers, regardless if they are trivial or not. |
 | responseHook | GraphQLInstrumentationExecutionResponseHook |     undefined     | Hook that allows adding custom span attributes based on the data returned from "execute" GraphQL action. |   |
 
 ## Verbosity
@@ -73,6 +75,13 @@ They are all disabled by default. User can opt in to any combination of them to
 
 When a resolver function is not defined on the schema for a field, graphql will use the default resolver which just looks for a property with that name on the object. If the property is not a function, it's not very interesting to trace.
 
+### ignoreResolveSpans
+
+The performance overhead for complex schemas with a lot of resolvers can be high due to the large number of spans created. When ignoreResolveSpans is set to true, no spans for resolvers will be created.
+
+If you are using `@apollo/server` as your graphql server, you might want to
+enable this option because all resolvers are [currently considered non-trivial](https://github.com/open-telemetry/opentelemetry-js-contrib/issues/1686).
+
 ### depth
 
 The depth is the number of nesting levels of the field, and the following is a query with a depth of 3: