doc: fix syntax for deftypefun

doc/chapters/advanced-api.texi

@@ -105,14 +105,14 @@ state". The return value should be considered as the new "current
 state" for future CRC computation.
 @end deftypefun
 
-@deftypefun uint32_t starpu_crc32_be(uint32_t input, uint32_t inputcrc)
+@deftypefun uint32_t starpu_crc32_be (uint32_t input, uint32_t inputcrc)
 todo: say what it is for
 Compute the CRC of a 32bit number seeded by the inputcrc "current
 state". The return value should be considered as the new "current
 state" for future CRC computation.
 @end deftypefun
 
-@deftypefun uint32_t starpu_crc32_string({char *}str, uint32_t inputcrc)
+@deftypefun uint32_t starpu_crc32_string ({char *}str, uint32_t inputcrc)
 todo: say what it is for
 Compute the CRC of a string seeded by the inputcrc "current state".
 The return value should be considered as the new "current state" for