Made the instructions of adding extra resources as part of extensions simpler (#11577)

docs/development/extensions-core/druid-lookups.md

@@ -36,7 +36,7 @@ To use this extension please make sure to  [include](../../development/extension
 > If using JDBC, you will need to add your database's client JAR files to the extension's directory.
 > For Postgres, the connector JAR is already included.
 > For MySQL, you can get it from https://dev.mysql.com/downloads/connector/j/.
-> Copy or symlink the downloaded file to `extensions/druid-lookups-cached-single` under the distribution root directory.
+> Copy or symlink the downloaded file inside the folder `extensions/druid-lookups-cached-single` under the distribution root directory.
 
 ## Architecture
 Generally speaking this module can be divided into two main component, namely, the data fetcher layer and caching layer.

docs/development/extensions-core/mysql.md

@@ -39,7 +39,7 @@ installed separately. There are a few ways to obtain this library:
 
 This should fetch a JAR file named similar to 'mysql-connector-java-x.x.xx.jar'.
 
-Copy or symlink this file to `extensions/mysql-metadata-storage` under the distribution root directory.
+Copy or symlink this file inside the folder `extensions/mysql-metadata-storage` under the distribution root directory.
 
 ## Setting up MySQL
 

docs/development/extensions-core/protobuf.md

@@ -99,7 +99,7 @@ This feature uses Confluent's Protobuf provider which is not included in the Dru
 - https://repo1.maven.org/maven2/org/jetbrains/kotlin/kotlin-stdlib/1.4.0/kotlin-stdlib-1.4.0.jar
 - https://repo1.maven.org/maven2/com/squareup/wire/wire-schema/3.2.2/wire-schema-3.2.2.jar
 
-Copy or symlink those files to `extensions/protobuf-extensions` under the distribution root directory.
+Copy or symlink those files inside the folder `extensions/protobuf-extensions` under the distribution root directory.
 
 ## Create Kafka Supervisor