Typo fix....

sorry guys

src/libslic3r/SLA/SLASupportTree.cpp

@@ -758,7 +758,7 @@ public:
     template<class T> inline const Pillar& pillar(T id) const {
         static_assert(std::is_integral<T>::value, "Invalid index type");
         assert(id >= 0 && id < m_pillars.size() &&
-               id < std::numerix_limits<size_t>::max());
+               id < std::numeric_limits<size_t>::max());
         return m_pillars[size_t(id)];
     }