Fix typos.

PiperOrigin-RevId: 716211176
Change-Id: Ibadfe13db89ed9047832b977e918faa3c5c6d9f1

src/user/user_util.h

@@ -211,7 +211,7 @@ class FilePath {
  private:
   static std::string AbsPrefix(const std::string& str);
   static std::string PathReduce(const std::string& str);
-  static bool IsSeperator(char c) {
+  static bool IsSeparator(char c) {
     return c == '/' || c == '\\';
   }
   static std::string Combine(const std::string& s1, const std::string& s2);