MAINT: instread --> instead

Follow-up to pandas-devgh-24648

Author: gfyoung

ci/code_checks.sh

@@ -149,7 +149,7 @@ if [[ -z "$CHECK" || "$CHECK" == "patterns" ]]; then
     RET=$(($RET + $?)) ; echo $MSG "DONE"
 
     # Check for the following code in testing: `unittest.mock`, `mock.Mock()` or `mock.patch`
-    MSG='Check that unittest.mock is not used (pytest builtin monkeypatch fixture should be used instread)' ; echo $MSG
+    MSG='Check that unittest.mock is not used (pytest builtin monkeypatch fixture should be used instead)' ; echo $MSG
     invgrep -r -E --include '*.py' '(unittest(\.| import )mock|mock\.Mock\(\)|mock\.patch)' pandas/tests/
     RET=$(($RET + $?)) ; echo $MSG "DONE"