chore(Grid): Add PDF export note (#2735)

* chore(Grid): Add PDF export note

* Update components/grid/export/pdf.md

Co-authored-by: Dimo Dimov <961014+dimodi@users.noreply.github.com>

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Co-authored-by: Dimo Dimov <961014+dimodi@users.noreply.github.com>

Author: ntacheva

components/grid/export/pdf.md

@@ -209,6 +209,7 @@ The PDF export has the following specifics:
 * PDF does not understand units different from `px` for the column `Width`, and if you use them (such as `rem` or `%`), it will fail to parse them and will render a collapsed (hidden) column with zero width.
 * When exporting Grid columns, you must provide appropriate `PaperSize` and `PageOrientation` properties. For example, if you want to render 20 columns (100px each) in an A4 sheet, then this will yield unexpected results. The column dimensions in a PDF file are fixed, thus they cannot be resized as in Excel, which requires the developer to ensure proper export dimensions.
 * Exporting to PDF in UI for Blazor is different from exporting in Kendo jQuery, where the full HTML is exported. The Blazor export to PDF will export the Grid to a table, similar to an Excel table. If you want [to export to PDF as HTML, you can use a custom approach](#custom-export).
+* Some PDF fonts do not include Cyrillic or other non-Latin characters. In such cases, [load a compatible font explicitly](https://docs.telerik.com/devtools/document-processing/knowledge-base/pdfprocessing-implement-fontsprovider).
 * Templates are not exported, because there is no provision in the framework for getting them at runtime. If a column, header or group header/footer has a template or aggregates, it will be ignored. The headers will be the `Title` of the column, the data is the data from the `Field`. If you need additional information, see if you can add it in a Field in the model, or create your own PDF file. Find a <a href="https://feedback.telerik.com/blazor/1485764-customize-the-Pdf-file-before-it-gets-to-the-client" target="_blank">project example on how to generate your own exported file</a>. Find additional information on how to [export an image that is rendered in a Grid column template](slug:grid-export-image-column-excel).
 
 @[template](/_contentTemplates/grid/export.md#export-common-notes)