change literals from float 1.0f to half 1.0h

ext/cl_khr_fp16.asciidoc

@@ -1827,12 +1827,12 @@ These conversions are performed as follows:
 `CL_SNORM_INT8` (8-bit signed integer) {rightarrow} `half`
 
 [none]
-* normalized `half` value = `max(-1.0f, round_to_half(c / 127))`
+* normalized `half` value = `max(-1.0h, round_to_half(c / 127))`
 
 `CL_SNORM_INT16` (16-bit signed integer) {rightarrow} `half`
 
 [none]
-* normalized `half` value = `max(-1.0f, round_to_half(c / 32767))`
+* normalized `half` value = `max(-1.0h, round_to_half(c / 32767))`
 
 The accuracy of the above conversions must be \<= 1.5 ulp except for the
 following cases.
@@ -1858,7 +1858,7 @@ For `CL_UNORM_INT16`
 For `CL_SNORM_INT8`
 
 [none]
-* -128 and -127 must convert to `-1.0j`,
+* -128 and -127 must convert to `-1.0h`,
 * 0 must convert to `0.0h` and
 * 127 must convert to `1.0h`