SLIDESDOC-623 Update the article "API Limitations"

[andreypotapovaspose]

Added keywords and description for SEO purposes.
Updated the text.

[nikolaysaulyak]

@andreypotapovaspose,

This article does not reflect the actual situation and raises the question - is it really needed in its current form?
From the text, it seems to imply that metadata (PPT, PPTX, ODP, PDF) contains two fields - "Application" and "Producer" - and that they cannot be changed.
However, the situation is different for these formats, and the article only creates confusion.

Please check the following code:

var pres = new Presentation();
pres.DocumentProperties.NameOfApplication = "MY-APP";
pres.Save("pres1.pptx", SaveFormat.Pptx);
pres.Save("pres1.odp", SaveFormat.Odp);
pres.Save("pres1.pdf", SaveFormat.Pdf);

1. Pptx
   Metadata contains a single field Application with the value "Aspose.Slides for .NET".
2. Odp
   Metadata contains a single field meta:generator with the value "MY-APP".
3. Pdf
   Metadata contains the field Creator - "Aspose.Slides for .NET 25.9"
   Metadata contains the field Producer - "Aspose.Slides for .NET 25.9"

Therefore, the article should be revised if it indeed reflects user requests, or simply removed as invalid.

[andreypotapovaspose]

@nikolaysaulyak,
Thank you for the notes. I have updated the article according to your notes.
Also, the ticket SLIDESNET-45121 has been added.