docs: Add doxygen comments to should_accept_page function

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Co-Authored-By: Claude Opus 4.5 <[email protected]>

Author: cfsmp3

src/lib_ccx/telxcc.c

@@ -900,8 +900,12 @@ void process_page(struct TeletextCtx *ctx, teletext_page_t *page, struct cc_subt
 		fflush(stderr);
 }
 
-// Helper function to check if a page should be accepted for extraction (issue #665)
-// Returns 1 if the page should be accepted, 0 otherwise
+/**
+ * Helper function to check if a page should be accepted for extraction (issue #665)
+ * @param page_number The teletext page number in BCD format
+ * @param is_subtitle_page Whether this page is marked as a subtitle page
+ * @return 1 if the page should be accepted, 0 otherwise
+ */
 static int should_accept_page(uint16_t page_number, int is_subtitle_page)
 {
 	// If extract_all_pages is set, accept all subtitle pages