Fix spelling typo.

FossilOrigin-Name: 6131a0002fea5d6f3b416a63a466bf2b69d1e12d
diff --git a/src/sqliteInt.h b/src/sqliteInt.h
index 4665162..ca40967 100644
--- a/src/sqliteInt.h
+++ b/src/sqliteInt.h
@@ -168,7 +168,7 @@
   + defined(SQLITE_ZERO_MALLOC) \
   + defined(SQLITE_MEMDEBUG)>1
 # error "Two or more of the following compile-time configuration options\
- are defined but at most one is allows:\
+ are defined but at most one is allowed:\
  SQLITE_SYSTEM_MALLOC, SQLITE_WIN32_MALLOC, SQLITE_MEMDEBUG,\
  SQLITE_ZERO_MALLOC"
 #endif