[SQL][DOC] Minor document fix in HadoopFsRelationProvider

Catch this while reading the code

Author: Jacky Li <lee.unreal@gmail.com>
Author: Jacky Li <jackylk@users.noreply.github.com>

Closes apache#7524 from jackylk/patch-11 and squashes the following commits:

b679011 [Jacky Li] fix doc
e10e211 [Jacky Li] [SQL] Minor document fix in HadoopFsRelationProvider

sql/core/src/main/scala/org/apache/spark/sql/sources/interfaces.scala

@@ -75,7 +75,7 @@ trait RelationProvider {
  * A new instance of this class with be instantiated each time a DDL call is made.
  *
  * The difference between a [[RelationProvider]] and a [[SchemaRelationProvider]] is that
- * users need to provide a schema when using a SchemaRelationProvider.
+ * users need to provide a schema when using a [[SchemaRelationProvider]].
  * A relation provider can inherits both [[RelationProvider]] and [[SchemaRelationProvider]]
  * if it can support both schema inference and user-specified schemas.
  *
@@ -111,7 +111,7 @@ trait SchemaRelationProvider {
  *
  * The difference between a [[RelationProvider]] and a [[HadoopFsRelationProvider]] is
  * that users need to provide a schema and a (possibly empty) list of partition columns when
- * using a SchemaRelationProvider. A relation provider can inherits both [[RelationProvider]],
+ * using a [[HadoopFsRelationProvider]]. A relation provider can inherits both [[RelationProvider]],
  * and [[HadoopFsRelationProvider]] if it can support schema inference, user-specified
  * schemas, and accessing partitioned relations.
  *