docs: grammar: count agreement: files

Signed-off-by: Josh Soref <jsoref@users.noreply.github.com>

backend/qingstor/qingstor.go

@@ -107,7 +107,7 @@ concurrently.
 NB if you set this to > 1 then the checksums of multipart uploads
 become corrupted (the uploads themselves are not corrupted though).
 
-If you are uploading small numbers of large file over high-speed link
+If you are uploading small numbers of large files over high-speed link
 and these uploads do not fully utilize your bandwidth, then increasing
 this may help to speed up the transfers.`,
 			Default:  1,

backend/s3/s3.go

@@ -1107,7 +1107,7 @@ If empty it will default to the environment variable "AWS_PROFILE" or
 This is the number of chunks of the same file that are uploaded
 concurrently.
 
-If you are uploading small numbers of large file over high-speed link
+If you are uploading small numbers of large files over high-speed link
 and these uploads do not fully utilize your bandwidth, then increasing
 this may help to speed up the transfers.`,
 			Default:  4,

docs/content/qingstor.md

@@ -262,7 +262,7 @@ concurrently.
 NB if you set this to > 1 then the checksums of multipart uploads
 become corrupted (the uploads themselves are not corrupted though).
 
-If you are uploading small numbers of large file over high-speed link
+If you are uploading small numbers of large files over high-speed link
 and these uploads do not fully utilize your bandwidth, then increasing
 this may help to speed up the transfers.
 

docs/content/s3.md

@@ -1328,7 +1328,7 @@ Concurrency for multipart uploads.
 This is the number of chunks of the same file that are uploaded
 concurrently.
 
-If you are uploading small numbers of large file over high-speed link
+If you are uploading small numbers of large files over high-speed link
 and these uploads do not fully utilize your bandwidth, then increasing
 this may help to speed up the transfers.