docs: Fix ifile source documentation

Author: tamer-hassan

website/cue/reference/components/sources/ifile.cue

@@ -18,7 +18,7 @@ components: sources: ifile: {
 		auto_generated:   true
 		acknowledgements: true
 		collect: {
-			checkpoint: enabled: true
+			checkpoint: enabled: false
 			from: {
 				service: services.files
 
@@ -441,6 +441,13 @@ components: sources: ifile: {
 		checkpointing: {
 			title: "Checkpointing"
 			body: """
+				Vector checkpoints the current read position after each
+				successful read. This ensures that Vector resumes where it left
+				off if restarted, preventing data from being read twice. The
+				checkpoint positions are stored in the data directory which is
+				specified via the global `data_dir` option, but can be overridden
+				via the `data_dir` option in the file source directly.
+
 				The `ifile` source introduces a new `checkpoint_interval` configuration option that
 				controls how frequently the current read position is saved to disk during normal operation.