Docs should specify # as comment symbol for GraphQL (#609)

Docs should specify `#` as comment symbol for GraphQL, currently specifies double quotations`""`

According to the GraphQL spec, '#' are used for comments, not double quotes. See the spec on comments here:

https://spec.graphql.org/October2021/#sec-Comments

Author: benbcjdev

website/pages/en/developing/creating-a-subgraph.mdx

@@ -422,11 +422,11 @@ This more elaborate way of storing many-to-many relationships will result in les
 
 #### Adding comments to the schema
 
-As per GraphQL spec, comments can be added above schema entity attributes using double quotations `""`. This is illustrated in the example below:
+As per GraphQL spec, comments can be added above schema entity attributes using the hash symble `#`. This is illustrated in the example below:
 
 ```graphql
 type MyFirstEntity @entity {
-  "unique identifier and primary key of the entity"
+  # unique identifier and primary key of the entity
   id: Bytes!
   address: Bytes!
 }