fix typo

Co-authored-by: Slanterns <slanterns.w@gmail.com>

Author: RalfJung

text/0000-float-semantics.md

@@ -26,7 +26,7 @@ It's time to stop leaving our users in the dark about what actually is and is no
 [guide-level-explanation]: #guide-level-explanation
 
 Primitive operations on floating-point types generally produce results that exactly match IEEE 754-2008:
-if you never use `to_bits`, `from_bits`, `is_sign_negative`, or `is_sign_poitive`, nor any unsafe operations that are equivalent to these safe methods, then your code will behave perfectly deterministically according to the IEEE specification.
+if you never use `to_bits`, `from_bits`, `is_sign_negative`, or `is_sign_positive`, nor any unsafe operations that are equivalent to these safe methods, then your code will behave perfectly deterministically according to the IEEE specification.
 In fact, this is true even if you do use these operations as long as you never call them on a NaN (or, in case of `from_bits`, use them to produce a NaN).
 
 If you *do* use these operations on NaNs, then the exact behavior you see can depend on compiler version, compiler flags, target architecture, and it can even be non-deterministic (i.e., running the same operation on the same inputs twice can yield different results).