typo: fix occured -> occurred

In English, the final letter is doubled when a word of two or more
syllables has stress on the final syllable so a correct form is
"occurred".

daemon/bindings/impl.c

@@ -76,7 +76,7 @@ void kr_bindings_register(lua_State *L)
 void lua_error_p(lua_State *L, const char *fmt, ...)
 {
 	/* Add a stack trace and throw the result as a lua error. */
-	luaL_traceback(L, L, "error occured here (config filename:lineno is at the bottom, if config is involved):", 0);
+	luaL_traceback(L, L, "error occurred here (config filename:lineno is at the bottom, if config is involved):", 0);
 	/* Push formatted custom message, prepended with "ERROR: ". */
 	lua_pushliteral(L, "\nERROR: ");
 	{

daemon/lua/sandbox.lua.in

@@ -19,7 +19,7 @@ day = 24 * hour
 
 -- Logging
 function panic(fmt, ...)
-        print(debug.traceback('error occured here (config filename:lineno is '
+        print(debug.traceback('error occurred here (config filename:lineno is '
                 .. 'at the bottom, if config is involved):', 2))
         error(string.format('ERROR: '.. fmt, ...), 0)
 end

daemon/scripting.rst

@@ -124,7 +124,7 @@ process for liveliness by connecting to the UNIX socket.
           },
           {
               false,  -- function failed
-              'error occured...',  -- the returned error message
+              'error occurred...',  -- the returned error message
               ['n'] = 2,
           },
           ['n'] = 2,