Update CONFIGURATION.md to mention HTTPS endpoint explicitly (#541)

Some users reached out to clarify if mountpoint-s3 will use HTTPS or HTTP to access Amazon S3. By updating this documentation, this is mentioned and can be found when performing text searches, etc..

Signed-off-by: Daniel Carl Jones <[email protected]>

doc/CONFIGURATION.md

@@ -74,7 +74,7 @@ Mountpoint also respects access control lists (ACLs) applied to objects in your
 
 ## S3 bucket configuration
 
-By default, Mountpoint will automatically mount your S3 bucket given only the bucket name, and will automatically select the appropriate S3 network endpoint. However, you can override this automation if you need finer control over how Mountpoint connects to your bucket.
+By default, Mountpoint will automatically mount your S3 bucket given only the bucket name, and will automatically select the appropriate S3 HTTPS endpoint. However, you can override this automation if you need finer control over how Mountpoint connects to your bucket.
 
 ### Mounting a bucket prefix
 
@@ -191,4 +191,4 @@ To increase the maximum object size for writes, use the `--part-size` command-li
 
 ## Logging
 
-By default, Mountpoint emits high-severity log information to [syslog](https://datatracker.ietf.org/doc/html/rfc5424) if available on your system. You can change what level of information is logged, and to where it is logged. See [LOGGING.md](LOGGING.md) for more details on configuring logging.
+By default, Mountpoint emits high-severity log information to [syslog](https://datatracker.ietf.org/doc/html/rfc5424) if available on your system. You can change what level of information is logged, and to where it is logged. See [LOGGING.md](LOGGING.md) for more details on configuring logging.