[chore][receiver/filelog] Clarify 'exclude' parameter documentation (o…

…pen-telemetry#31261)

Resolves open-telemetry#31229

receiver/filelogreceiver/README.md

@@ -22,7 +22,7 @@ Tails and parses logs from files.
 | Field | Default | Description |
 |-------------------------------------|--------------------------------------|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
 | `include` | required | A list of file glob patterns that match the file paths to be read. |
-| `exclude` | [] | A list of file glob patterns to exclude from reading.   |
+| `exclude` | [] | A list of file glob patterns to exclude from reading. This is applied against the paths matched by `include`. |
 | `start_at` | `end` | At startup, where to start reading logs from the file. Options are `beginning` or `end`. |
 | `multiline` | | A `multiline` configuration block. See [below](#multiline-configuration) for more details. |
 | `force_flush_period` | `500ms` | [Time](#time-parameters) since last read of data from file, after which currently buffered log should be send to pipeline. A value of `0` will disable forced flushing. |