Added missing docs

docs/api/srfi/143.md

@@ -85,73 +85,218 @@ Semantically equivalent to `=`.
 
 # fx<? 
 
+    (fx<? i j)
+
+Semantically equivalent to `<`.
+
 # fx>? 
 
+    (fx>? i j)
+
+Semantically equivalent to `>`.
+
 # fx<=? 
 
+    (fx<=? i j)
+
+Semantically equivalent to `<=`.
+
 # fx>=?
 
+    (fx>=? i j)
+
+Semantically equivalent to `>=`.
+
 # fxzero? 
 
+    (fxzero? i)
+
+Semantically equivalent to `zero?`.
+
 # fxpositive? 
 
+    (fxpostiive? i)
+
+Semantically equivalent to `positive?`.
+
 # fxnegative? 
 
+    (fxnegative? i)
+
+Semantically equivalent to `negative?`.
+
 # fxodd? 
 
+    (fxodd? i)
+
+Semantically equivalent to `odd?`.
+
 # fxeven?
 
+    (fxeven? i)
+
+Semantically equivalent to `even?`.
+
 # fxmax 
 
+    (fxmax i j)
+
+Semantically equivalent to `max`.
+
 # fxmin
 
+    (fxmin i j)
+
+Semantically equivalent to `min`.
+
 # fx+ 
 
+    (fx+ i j)
+
+Semantically equivalent to `+`, but accepts exactly two arguments.
+
 # fx- 
 
+    (fx- i j)
+
+Semantically equivalent to `-`, but accepts exactly two arguments.
+
 # fx*
 
+    (fx* i j)
+
+Semantically equivalent to `*`, but accepts exactly two arguments.
+
 # fxneg
 
+    (fxneg i)
+
+Semantically equivalent to `-`, but accepts exactly one argument.
+
 # fxquotient 
 
+    (fxquotient i j)
+
+Semantically equivalent to `quotient`.
+
 # fxremainder
 
+    (fxremainder i j)
+
+Semantically equivalent to `remainder`.
+
 # fxabs 
 
+    (fxabs i)
+
+Semantically equivalent to `abs`.
+
 # fxsquare 
 
+    (fxsquare i)
+
+Semantically equivalent to `square`.
+
 # fxsqrt 
 
+    (fxsqrt i)
+
+Semantically equivalent to `sqrt`.
+
 # fxnot 
 
+    (fxnot i)
+
+Semantically equivalent to `bitwise-not`.
+
 # fxand 
 
+    (fxand i j)
+
+Semantically equivalent to `bitwise-and`.
+
 # fxior 
 
+    (fxior i j)
+
+Semantically equivalent to `bitwise-ior`.
+
 # fxxor 
 
+    (fxxor i j)
+
+Semantically equivalent to `bitwise-xor`.
+
 # fxarithmetic-shift 
 
+    (fxarithmetic-shift i count)
+
+Semantically equivalent to `arithmetic-shift`, except that it is an error for the absolute value of count to exceed `w-1`.
+
 # fxarithmetic-shift-left 
 
+    (fxarithmetic-shift-left i count)
+
+The same as `fxarithmetic-shift` except that a negative value of count is an error. This is provided for additional efficiency.
+
 # fxarithmetic-shift-right
 
+    (fxarithmetic-shift-right i count)
+
+The same as `fxarithmetic-shift` except that a non-negative value of count specifies the number of bits to shift right, and a negative value is an error. This is provided for additional efficiency.
+
 # fxbit-count 
 
+    (fxbit-count i)
+
+Semantically equivalent to SRFI 151 `bit-count`.
+
 # fxlength 
 
+    (fxlength i)
+
+Semantically equivalent to `integer-length`.
+
 # fxif 
 
+    (fxif mask i j)
+
+Semantically equivalent to `bitwise-if`.
+
+
 # fxbit-set? 
 
+    (fxbit-set? index i)
+
+Semantically equivalent to SRFI 151 `bit-set?`, except that it is an error for `index` to be larger than or equal to `fx-width`.
+
 # fxcopy-bit
 
+    (fxcopy-bit index i boolean)
+
+Semantically equivalent to SRFI 151 `copy-bit`, except that it is an error for `index` to be larger than or equal to `fx-width`.
+
 # fxfirst-set-bit 
+    (fxfirst-set-bit i)
+
+Semantically equivalent to `first-set-bit`.
+
 
 # fxbit-field
 
+    (fxbit-field i start end)
+
+Semantically equivalent to `bit-field`.
+
 # fxbit-field-rotate 
 
+    (fxbit-field-rotate i count start end)
+
+Semantically equivalent to SRFI 151 `bit-field-rotate`.
+
 # fxbit-field-reverse
 
+    (fxbit-field-reverse i start end)
+
+Semantically equivalent to `bit-field-reverse`.
+