docs: correct pipe name FileParsePipe to ParseFilePipe in file upload guide

The class is named ParseFilePipe everywhere else in this guide and in the
framework. The single FileParsePipe reference reads as the correct class to
developers searching for it, so the name needs to match.

Author: emmayusufu

content/techniques/file-upload.md

@@ -133,7 +133,7 @@ export abstract class FileValidator<TValidationOptions = Record<string, any>> {
 - `MaxFileSizeValidator` - Checks if a given file's size is less than the provided value (measured in `bytes`)
 - `FileTypeValidator` - Checks if a given file's mime-type matches a given string or RegExp.  By default, validates the mime-type using file content [magic number](https://www.ibm.com/support/pages/what-magic-number)
 
-To understand how these can be used in conjunction with the aforementioned `FileParsePipe`, we'll use an altered snippet of the last presented example:
+To understand how these can be used in conjunction with the aforementioned `ParseFilePipe`, we'll use an altered snippet of the last presented example:
 
 ```typescript
 @UploadedFile(