docs(tem): update attachments mimetypes available (#4822)

* docs(tem): update attachments mimetypes available

Add new available mimetypes for transactional email attachment files.

* fix tabs and spaces

Author: jerjako

pages/transactional-email/reference-content/tem-capabilities-and-limits.mdx

@@ -60,13 +60,16 @@ The attachments available are the following:
 | ICS                          | `application/ics`        |
 | CSV (comma-separated values) | `text/csv`               |
 | JPEG image                   | `image/jpeg` `image/jpg` |
-| PNG file                     | `image/png`              |
-| GIF file                     | `image/gif`              |
-| XML file                     | `application/xml` `text/xml` |
-| xslx                         | `application/vnd.openxmlformats-officedocument.spreadsheetml.sheet` |
-| xltx	                       | `application/vnd.openxmlformats-officedocument.spreadsheetml.template` |
-| xls                          | `application/vnd.ms-excel` |
-| ods	                         | `application/vnd.oasis.opendocument.spreadsheet` |
+| PNG                          | `image/png`              |
+| GIF                          | `image/gif`              |
+| XML                          | `application/xml` `text/xml` |
+| XSLX                         | `application/vnd.openxmlformats-officedocument.spreadsheetml.sheet` |
+| XLTS                         | `application/vnd.openxmlformats-officedocument.spreadsheetml.template` |
+| XLS                          | `application/vnd.ms-excel` |
+| ODS                          | `application/vnd.oasis.opendocument.spreadsheet` |
+| P7S                          | `application/pkcs7-signature` |
+| SVG                          | `image/svg+xml`          |
+
 
 
 <Message type="important">
@@ -85,4 +88,4 @@ Transactional Email's SMTP relay supports the following [ESMTP extensions](https
 - ENHANCEDSTATUSCODES
 - CHUNKING
 - STARTTLS
-- SIZE
+- SIZE