chore: fix struct name in comment (#7114)

Signed-off-by: bytetigers <bytetiger@icloud.com>

replacer.go

@@ -335,7 +335,7 @@ type replacementProvider interface {
 	replace(key string) (any, bool)
 }
 
-// fileReplacementsProvider handles {file.*} replacements,
+// fileReplacementProvider handles {file.*} replacements,
 // reading a file from disk and replacing with its contents.
 type fileReplacementProvider struct{}
 
@@ -360,7 +360,7 @@ func (f fileReplacementProvider) replace(key string) (any, bool) {
 	return string(body), true
 }
 
-// globalDefaultReplacementsProvider handles replacements
+// globalDefaultReplacementProvider handles replacements
 // that can be used in any context, such as system variables,
 // time, or environment variables.
 type globalDefaultReplacementProvider struct{}