Remove .docm support (#751)

Author: Paul-Cornell

snippets/general-shared-text/supported-file-types-platform.mdx

@@ -9,7 +9,6 @@ By file extension:
 | `.dbf` |
 | `.dif`* |
 | `.doc` |
-| `.docm` |
 | `.docx` |
 | `.dot` |
 | `.dotm` |
@@ -75,7 +74,7 @@ By file type:
 | Spreadsheet | `.et`, `.fods`, `.mw`, `.xls`, `.xlsx` |
 | StarOffice | `.sxg` |
 | TSV | `.tsv` |
-| Word processing | `.abw`, `.doc`, `.docm`, `.docx`, `.dot`, `.dotm`, `.hwp`, `.zabw` |
+| Word processing | `.abw`, `.doc`, `.docx`, `.dot`, `.dotm`, `.hwp`, `.zabw` |
 | XML | `.xml` |
 
 `*` For `.dif`, `\n` characters in `.dif` files are supported, but `\r\n` characters will raise the error