Fix typo in spec.md

Remove redundant `to` in `to to`.

spec.md

@@ -6,7 +6,7 @@ A compliant README must satisfy all the requirements listed below.
 
 **Requirements:**
   - Be called README.md (with capitalization).
-  - If the project supports i18n, the file must be named accordingly: `README.de.md`, where `de` is the BCP 47 Language tag. For naming, prioritize non-regional subtags for languages. If there is only one README and the language is not English, then a different language in the text is permissible without needing to to specify the BCP tag: e.g., `README.md` can be in German if there is no `README.md` in another language. Where there are multiple languages, `README.md` is reserved for English.
+  - If the project supports i18n, the file must be named accordingly: `README.de.md`, where `de` is the BCP 47 Language tag. For naming, prioritize non-regional subtags for languages. If there is only one README and the language is not English, then a different language in the text is permissible without needing to specify the BCP tag: e.g., `README.md` can be in German if there is no `README.md` in another language. Where there are multiple languages, `README.md` is reserved for English.
   - Be a valid Markdown file.
   - Sections must appear in order given below. Optional sections may be omitted.
   - Sections must have the titles listed below, unless otherwise specified. If the README is in another language, the titles must be translated into that language.