Fix FPDF_GetPageLabel API typo.

public/fpdf_doc.h

Index: public/fpdf_doc.h
diff --git a/public/fpdf_doc.h b/public/fpdf_doc.h
index 10f899549b61df57552161ec291d666e0af3fa92..9d55a2e826d72aff31559c522e77e2cb34caaa7b 100644
--- a/public/fpdf_doc.h
+++ b/public/fpdf_doc.h
@@ -313,10 +313,10 @@ DLLEXPORT unsigned long STDCALL FPDF_GetMetaText(FPDF_DOCUMENT document,
 // The |buffer| is always encoded in UTF-16LE. The |buffer| is followed by two
 // bytes of zeros indicating the end of the string.  If |buflen| is less than
 // the returned length, or |buffer| is NULL, |buffer| will not be modified.
-DLLEXPORT unsigned long STDCALL FPDF_GetPagelLabel(FPDF_DOCUMENT document,
-                                                   int page_index,
-                                                   void* buffer,
-                                                   unsigned long buflen);
+DLLEXPORT unsigned long STDCALL FPDF_GetPageLabel(FPDF_DOCUMENT document,
+                                                  int page_index,
+                                                  void* buffer,
+                                                  unsigned long buflen);
 
 #ifdef __cplusplus
 }  // extern "C"