fix: typo

Author: ganeshnj

docs/RFCs/0010-logging-in-libdatadog.md

@@ -104,7 +104,7 @@ pub struct FileConfig<'a> {
     pub path: CharSlice<'a>,
     /// Maximum size in bytes for each log file.
     /// Set to 0 to disable size-based rotation.
-    pub size_bytes: u64,
+    pub max_size_bytes: u64,
     /// Maximum total number of files (current + rotated) to keep on disk.
     /// When this limit is exceeded, the oldest rotated files are deleted.
     /// Set to 0 to disable file cleanup.