Apply suggestions from code review

Co-authored-by: Alex Beregszaszi <alex@rtfs.hu>

Author: gumb0

include/fizzy/fizzy.h

@@ -32,9 +32,9 @@ typedef struct FizzyExecutionResult
 {
     /// Whether execution ended with a trap.
     bool trapped;
-    /// Whether function returned a value. Valid only if trapped == false
+    /// Whether function returned a value. Valid only if trapped equals false.
     bool has_value;
-    /// Value returned from a function. Valid only if has_value == true
+    /// Value returned from a function. Valid only if has_value equals true.
     union FizzyValue value;
 } FizzyExecutionResult;
 
@@ -43,7 +43,7 @@ typedef struct FizzyExecutionResult
 ///
 /// @param context      Opaque pointer to execution context.
 /// @param instance     Pointer to module instance.
-/// @param args         Pointer to the argument array. Can be NULL if function has 0 inputs.
+/// @param args         Pointer to the argument array. Can be NULL iff args_size equals 0.
 /// @param args_size    Size of the  argument array.
 /// @param depth        Call stack depth.
 typedef struct FizzyExecutionResult (*FizzyExternalFn)(void* context,
@@ -76,7 +76,7 @@ void fizzy_free_module(const struct FizzyModule* module);
 ///
 /// @param module                   Pointer to module.
 /// @param imported_functions       Pointer to the imported function array.
-/// @param imported_functions_size  Size of the imported function array.
+/// @param imported_functions_size  Size of the imported function array. Can be zero.
 struct FizzyInstance* fizzy_instantiate(const struct FizzyModule* module,
     const struct FizzyExternalFunction* imported_functions, size_t imported_functions_size);