[KYUUBI #3191] [DOCS] Add missing binary scala version in engine jar name

### _Why are the changes needed?_

Minor doc fix.

### _How was this patch tested?_
- [ ] Add some test cases that check the changes thoroughly including negative and positive cases if possible

- [ ] Add screenshots for manual tests if appropriate

- [ ] [Run test](https://kyuubi.apache.org/docs/latest/develop_tools/testing.html#running-tests) locally before make a pull request

Closes #3191 from pan3793/doc-jar.

Closes #3191

6a9c6dc [Cheng Pan] [DOCS] Add missing binary scala version in engine jar name

Authored-by: Cheng Pan <chengpan@apache.org>
Signed-off-by: Cheng Pan <chengpan@apache.org>

Author: pan3793

docs/connector/flink/hudi.rst

@@ -42,7 +42,7 @@ Dependencies
 
 The **classpath** of kyuubi flink sql engine with Hudi supported consists of
 
-1. kyuubi-flink-sql-engine-|release|.jar, the engine jar deployed with Kyuubi distributions
+1. kyuubi-flink-sql-engine-|release|_2.12.jar, the engine jar deployed with Kyuubi distributions
 2. a copy of flink distribution
 3. hudi-flink<flink.version>-bundle_<scala.version>-<hudi.version>.jar (example: hudi-flink1.14-bundle_2.12-0.11.1.jar), which can be found in the `Maven Central`_
 

docs/connector/flink/iceberg.rst

@@ -43,7 +43,7 @@ Dependencies
 
 The **classpath** of kyuubi flink sql engine with Iceberg supported consists of
 
-1. kyuubi-flink-sql-engine-|release|.jar, the engine jar deployed with Kyuubi distributions
+1. kyuubi-flink-sql-engine-|release|_2.12.jar, the engine jar deployed with Kyuubi distributions
 2. a copy of flink distribution
 3. iceberg-flink-runtime-<flink.version>-<iceberg.version>.jar (example: iceberg-flink-runtime-1.14-0.14.0.jar), which can be found in the `Maven Central`_
 

docs/connector/spark/delta_lake.rst

@@ -46,7 +46,7 @@ Dependencies
 
 The **classpath** of kyuubi spark sql engine with delta lake supported consists of
 
-1. kyuubi-spark-sql-engine-|release|.jar, the engine jar deployed with kyuubi distributions
+1. kyuubi-spark-sql-engine-|release|_2.12.jar, the engine jar deployed with kyuubi distributions
 2. a copy of spark distribution
 3. delta-core & delta-storage, which can be found in the `Maven Central`_
 

docs/connector/spark/flink_table_store.rst

@@ -44,7 +44,7 @@ Dependencies
 
 The **classpath** of kyuubi spark sql engine with Flink Table Store supported consists of
 
-1. kyuubi-spark-sql-engine-|release|.jar, the engine jar deployed with Kyuubi distributions
+1. kyuubi-spark-sql-engine-|release|_2.12.jar, the engine jar deployed with Kyuubi distributions
 2. a copy of spark distribution
 3. flink-table-store-spark-<version>.jar (example: flink-table-store-spark-0.2.jar), which can be found in the `Maven Central`_
 

docs/connector/spark/hudi.rst

@@ -43,7 +43,7 @@ Dependencies
 
 The **classpath** of kyuubi spark sql engine with Hudi supported consists of
 
-1. kyuubi-spark-sql-engine-|release|.jar, the engine jar deployed with Kyuubi distributions
+1. kyuubi-spark-sql-engine-|release|_2.12.jar, the engine jar deployed with Kyuubi distributions
 2. a copy of spark distribution
 3. hudi-spark<spark.version>-bundle_<scala.version>-<hudi.version>.jar (example: hudi-spark3.2-bundle_2.12-0.11.1.jar), which can be found in the `Maven Central`_
 

docs/connector/spark/iceberg.rst

@@ -45,7 +45,7 @@ Dependencies
 
 The **classpath** of kyuubi spark sql engine with Iceberg supported consists of
 
-1. kyuubi-spark-sql-engine-|release|.jar, the engine jar deployed with Kyuubi distributions
+1. kyuubi-spark-sql-engine-|release|_2.12.jar, the engine jar deployed with Kyuubi distributions
 2. a copy of spark distribution
 3. iceberg-spark-runtime-<spark.version>_<scala.version>-<iceberg.version>.jar (example: iceberg-spark-runtime-3.2_2.12-0.14.0.jar), which can be found in the `Maven Central`_
 

docs/connector/spark/tidb.rst

@@ -47,7 +47,7 @@ Dependencies
 ************
 The classpath of kyuubi spark sql engine with TiDB supported consists of
 
-1. kyuubi-spark-sql-engine-|release|.jar, the engine jar deployed with Kyuubi distributions
+1. kyuubi-spark-sql-engine-|release|_2.12.jar, the engine jar deployed with Kyuubi distributions
 2. a copy of spark distribution
 3. tispark-assembly-<spark.version>_<scala.version>-<tispark.version>.jar (example: tispark-assembly-3.2_2.12-3.0.1.jar), which can be found in the `Maven Central`_