docs: updating python requirement and envrionment varaiable information (#900)

Author: JuanLeee

README.md

@@ -49,9 +49,8 @@ with AwsWrapperConnection.connect(
 ) as awsconn:
     awscursor = awsconn.cursor()
     awscursor.execute("SELECT aurora_db_instance_identifier()")
-    awscursor.fetchone()
-    for record in awscursor:
-        print(record)
+    row = awscursor.fetchone()
+    print(row)
 ```
 The `AwsWrapperConnection#connect` method accepts the connection configuration through both the connection string and the keyword arguments.
 
@@ -72,9 +71,8 @@ with AwsWrapperConnection.connect(
 ) as awsconn:
     awscursor = awsconn.cursor()
     awscursor.execute("SELECT @@aurora_server_id")
-    awscursor.fetchone()
-    for record in awscursor:
-        print(record)
+    row = awscursor.fetchone()
+    print(row)
 ```
 
 For more details on how to download the AWS Advanced Python Driver, minimum requirements to use it, 
@@ -201,7 +199,7 @@ For all other questions, please use [GitHub discussions](https://github.com/awsl
 
 1. Set up your environment by following the directions in the [Development Guide](./docs/development-guide/DevelopmentGuide.md).
 2. To contribute, first make a fork of this project. 
-3. Make any changes on your fork. Make sure you are aware of the requirements for the project (e.g. do not require Python 3.7 if we are supporting Python 3.8 and higher).
+3. Make any changes on your fork. Make sure you are aware of the requirements for the project (e.g. do not require Python 3.7 if we are supporting Python 3.8 - 3.11 (inclusive)).
 4. Create a pull request from your fork. 
 5. Pull requests need to be approved and merged by maintainers into the main branch. <br />
 

docs/GettingStarted.md

@@ -4,7 +4,7 @@
 
 Before using the AWS Advanced Python Driver, you must install:
 
-- Python 3.8+.
+- Python 3.8 - 3.11 (inclusive).
 - The AWS Advanced Python Driver.
 - Your choice of underlying Python driver. 
   - To use the wrapper with Aurora with PostgreSQL compatibility, install [Psycopg](https://github.com/psycopg/psycopg).

docs/development-guide/DevelopmentGuide.md

@@ -1,7 +1,7 @@
 # Development Guide
 
 ### Setup
-Make sure you have Python 3.8+ installed, along with your choice of underlying Python driver (see [minimum requirements](../GettingStarted.md#minimum-requirements)).
+Make sure you have Python 3.8 - 3.11 (inclusive) installed, along with your choice of underlying Python driver (see [minimum requirements](../GettingStarted.md#minimum-requirements)).
 
 Clone the AWS Advanced Python Driver repository:
 

docs/development-guide/IntegrationTests.md

@@ -117,7 +117,7 @@ unset FILTER  # Done testing the IAM tests, unset FILTER
 
 | Environment Variable Name | Required | Description                                                                                                                                                                                                      | Example Value                                |
 |---------------------------|----------|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|----------------------------------------------|
-| `DB_USER`                 | Yes      | The username to access the database.                                                                                                                                                                             | `admin`                                      |
+| `DB_USERNAME`             | Yes      | The username to access the database.                                                                                                                                                                             | `admin`                                      |
 | `DB_PASSWORD`             | Yes      | The database cluster password.                                                                                                                                                                                   | `password`                                   |
 | `DB_DATABASE_NAME`        | No       | Name of the database that will be used by the tests. The default database name is test.                                                                                                                          | `test_db_name`                               |
 | `RDS_CLUSTER_NAME`        | Yes      | The database identifier for your Aurora or RDS cluster. Must be a unique value to avoid conflicting with existing clusters.                                                                                      | `db-identifier`                              |