Update docs for append & merge operator changes (#474)

- Update the docs REFERENCE.md and TUTORIAL.md to make sure the examples
- Run the example DAG successfully from tutorial.

REFERENCE.md

@@ -335,10 +335,9 @@ The `aql.append` function merges tables assuming that there are no conflicts. Yo
 
 ```python
 foo = aql.append(
-    append_table=Table("some_table", "snowflake_default"),
-    main_table=Table("main_table", "snowflake_default"),
+    source_table=Table("some_table", "snowflake_default"),
+    target_table=Table("target_table", "snowflake_default"),
     columns=["Bedrooms", "Bathrooms"],
-    casted_columns={"Age": "INTEGER"},
 )
 ```
 
@@ -354,22 +353,20 @@ Postgres:
 ```python
 a = aql.merge(
     target_table=Table("target_table", "postgres_default"),
-    merge_table=Table("merge_table", "postgres_default"),
-    merge_keys=["list", "sell"],
-    target_columns=["list", "sell", "taxes"],
-    merge_columns=["list", "sell", "age"],
-    conflict_strategy="update",
+    source_table=Table("source_table", "postgres_default"),
+    target_conflict_columns=["list", "sell"],
+    columns={"list": "list", "sell": "sell", "age": "taxes"},
+    if_conflicts="update",
 )
 ```
 Snowflake:
 ```python
 a = aql.merge(
     target_table=Table("target_table", "snowflake_default"),
-    merge_table=Table("merge_table", "snowflake_default"),
-    merge_keys={"list": "list", "sell": "sell"},
-    target_columns=["list", "sell"],
-    merge_columns=["list", "sell"],
-    conflict_strategy="ignore",
+    source_table=Table("source_table", "snowflake_default"),
+    target_conflict_columns={"list": "list", "sell": "sell"},
+    columns=["list", "sell"],
+    if_conflicts="ignore",
 )
 ```
 

TUTORIAL.md

@@ -155,22 +155,22 @@ We'll create some auxiliary tables in Snowflake and populate with a small amount
 
 ```sql
 
-CREATE OR REPLACE TABLE customers_table (customer_id CHAR(10), customer_name VARCHAR(100), type VARCHAR(10) )
+CREATE OR REPLACE TABLE customers_table (customer_id CHAR(10), customer_name VARCHAR(100), type VARCHAR(10) );
 
-INSERT INTO customers_table (CUSTOMER_ID, CUSTOMER_NAME,TYPE) VALUES ('CUST1','NAME1','TYPE1'),('CUST2','NAME2','TYPE1'),('CUST3','NAME3','TYPE2')
+INSERT INTO customers_table (CUSTOMER_ID, CUSTOMER_NAME,TYPE) VALUES ('CUST1','NAME1','TYPE1'),('CUST2','NAME2','TYPE1'),('CUST3','NAME3','TYPE2');
 ```
 
 * Create and populate a reporting table into which we'll merge our transformed data:
 
 ```sql
 
 CREATE OR REPLACE TABLE reporting_table (
-    CUSTOMER_ID CHAR(10), CUSTOMER_NAME VARCHAR(100), ORDER_ID CHAR(10), PURCHASE_DATE DATE, AMOUNT FLOAT, TYPE CHAR(10));
+    CUSTOMER_ID CHAR(30), CUSTOMER_NAME VARCHAR(100), ORDER_ID CHAR(10), PURCHASE_DATE DATE, AMOUNT FLOAT, TYPE CHAR(10));
 
 INSERT INTO reporting_table (CUSTOMER_ID, CUSTOMER_NAME, ORDER_ID, PURCHASE_DATE, AMOUNT, TYPE) VALUES
 ('INCORRECT_CUSTOMER_ID','INCORRECT_CUSTOMER_NAME','ORDER2','2/2/2022',200,'TYPE1'),
 ('CUST3','NAME3','ORDER3','3/3/2023',300,'TYPE2'),
-('CUST4','NAME4','ORDER4','4/4/2022',400,'TYPE2')
+('CUST4','NAME4','ORDER4','4/4/2022',400,'TYPE2');
 ```
 ***
 # Simple ETL workflow
@@ -252,11 +252,10 @@ with dag:
             name=SNOWFLAKE_REPORTING,
             conn_id=SNOWFLAKE_CONN_ID,
         ),
-        merge_table=joined_data,
-        merge_columns=["customer_id", "customer_name"],
-        target_columns=["customer_id", "customer_name"],
-        merge_keys={"order_id": "order_id"},
-        conflict_strategy="update",
+        source_table=joined_data,
+        target_conflict_columns=["order_id"],
+        columns=["customer_id", "customer_name"],
+        if_conflicts="update",
     )
 
     purchase_dates = transform_dataframe(reporting_table)
@@ -330,11 +329,10 @@ reporting_table = aql.merge(
         name=SNOWFLAKE_REPORTING,
         conn_id=SNOWFLAKE_CONN_ID,
     ),
-    merge_table=joined_data,
-    merge_columns=["customer_id", "customer_name"],
-    target_columns=["customer_id", "customer_name"],
-    merge_keys={"order_id": "order_id"},
-    conflict_strategy="update",
+    source_table=joined_data,
+    target_conflict_columns=["order_id"],
+    columns=["customer_id", "customer_name"],
+    if_conflicts="update",
 )
 ```