Fix typo in function name (#1478)

diff --git a/rust/platform/triple_mappings.bzl b/rust/platform/triple_mappings.bzl
index b73a3f1..0ff191a 100644
--- a/rust/platform/triple_mappings.bzl
+++ b/rust/platform/triple_mappings.bzl
@@ -204,7 +204,7 @@
     # figure out how they're doing this
     return []
 
-def extra_ios_constriants(triple):
+def extra_ios_constraints(triple):
     """Add constraints specific to iOS targets.
 
     Args:
@@ -302,6 +302,6 @@
     constraint_set += vendor_to_constraints(triple_struct.vendor)
     constraint_set += system_to_constraints(triple_struct.system)
     constraint_set += abi_to_constraints(triple_struct.abi)
-    constraint_set += extra_ios_constriants(triple_struct)
+    constraint_set += extra_ios_constraints(triple_struct)
 
     return constraint_set