docs(configuration-file): update Multilingual Spreadsheet example (#567)

Author: andrii-bodnar

src/content/docs/developer/dev-tools/configuration-file.mdx

@@ -309,7 +309,7 @@ If a CSV or XLS/XLSX file contains the translations for all target languages, yo
 CSV file example:
 
 ```csv
-identifier,source_phrase,context,Ukrainian,Russian,French
+identifier,source_phrase,context,Ukrainian,Spanish (Mexico),French
 ident1,Source 1,Context 1,,,
 ident2,Source 2,Context 2,,,
 ident3,Source 3,Context 3,,,
@@ -323,15 +323,15 @@ Configuration file example:
     "source": "multicolumn.csv",
     "translation": "multicolumn.csv",
     "first_line_contains_header": true,
-    "scheme": "identifier,source_phrase,context,uk,ru,fr"
+    "scheme": "identifier,source_phrase,context,uk,es-MX,fr"
   }
 ]
 ```
 
 If your CSV or XLS/XLSX file contains columns that should be skipped on import, use `none` for such columns in the scheme, for example:
 
 ```yml title="crowdin.yml"
-"scheme" : "identifier,source_phrase,context,uk,none,ru,none,fr"
+"scheme" : "identifier,source_phrase,context,uk,none,es-MX,none,fr"
 ```
 
 ##### Scheme Constants