docs: in_blob: fix ring buffer config key prefix (#2364)

Rename `threaded.ring_buffer.capacity` and `threaded.ring_buffer.window`
to `thread.ring_buffer.capacity` and `thread.ring_buffer.window` to
match the actual config keys registered in Fluent Bit source code
(flb_input.c input_global_properties[]) and to be consistent with
other input plugin documentation (tail, opentelemetry, etc.).

Signed-off-by: jinyong.choi <inimax801@gmail.com>

Author: jinyongchoi

pipeline/inputs/blob.md

@@ -21,8 +21,8 @@ The plugin supports the following configuration parameters:
 | `storage.type`                      | Sets the storage type for this input. Options: `filesystem` (persists data to disk), `memory` (stores data in memory only), or `memrb` (memory ring buffer). For production environments with high data volumes, consider using `filesystem` to prevent data loss during restarts.                                                                                                                                                                                  | `memory` |
 | `tag`                               | Set a tag for the events generated by this input plugin. Tags are used for routing records to specific outputs. Supports tag expansion with wildcards.                                                                                                                                                                                                         | _none_   |
 | `threaded`                          | Indicates whether to run this input in its own [thread](../../administration/multithreading.md#inputs). When enabled, the plugin runs in a separate thread, which can improve performance for I/O-bound operations.                                                                                                                                                          | `false`  |
-| `threaded.ring_buffer.capacity`     | Set custom ring buffer capacity when the input runs in threaded mode. This determines how many records can be buffered in the ring buffer before blocking.                                                                                                                                                                                            | `1024`   |
-| `threaded.ring_buffer.window`       | Set custom ring buffer window percentage for threaded inputs. This controls when the ring buffer is considered "full" and triggers backpressure handling.                                                                                                                                                                                                    | `5`      |
+| `thread.ring_buffer.capacity`       | Set custom ring buffer capacity when the input runs in threaded mode. This determines how many records can be buffered in the ring buffer before blocking.                                                                                                                                                                                            | `1024`   |
+| `thread.ring_buffer.window`         | Set custom ring buffer window percentage for threaded inputs. This controls when the ring buffer is considered "full" and triggers backpressure handling.                                                                                                                                                                                                    | `5`      |
 | `upload_failure_action`             | Action to perform on the file after upload failure. Supported values: `delete` (delete the file), `add_suffix` (rename file by appending a suffix), `emit_log` (emit a log record with a custom message). When set to `add_suffix`, use `upload_failure_suffix` to specify the suffix. When set to `emit_log`, use `upload_failure_message` to specify the message.                                                                                                                                                                                                                           | _none_   |
 | `upload_failure_message`            | Message to emit as a log record after upload failure. Only used when `upload_failure_action` is set to `emit_log`. This can be used for debugging or monitoring purposes.                                                                                                                                                                                                                          | _none_   |
 | `upload_failure_suffix`             | Suffix to append to the filename after upload failure. Only used when `upload_failure_action` is set to `add_suffix`. For example, if set to `.failed`, a file named `data.bin` will be renamed to `data.bin.failed`.                                                                                                                                                                                                                           | _none_   |