Added note about template main and corrected typo

README.md

@@ -196,6 +196,13 @@ T foo((T()));
 ```cpp
 struct S { ;;;;; };
 ```
+- The following is The following code is probably, technically, well-formed in the current working draft of the
+  standard (and may have been before too):
+```cpp
+template<typename T> void main(T) {}
+int main() {}
+```
+  This is related to changes in P1787. Sadly, no compiler supports this.
 - [Function try-blocks](https://en.cppreference.com/w/cpp/language/function-try-block) are a
   convenient way to wrap an entire function body with exception handlers and the only way to catch
   exceptions in member initializer lists:
@@ -390,7 +397,7 @@ int main(int a, char *b[(first++ > 8) ? 1 : main()]) {
 int main(int, char*[puts("Hello World")]) {}
 ```
 - `auto` is a keyword in C. Not to be confused with C++ `auto`, C `auto` does absolutely nothing.
-- `extern cosnt void x;` is valid a valid declaration in C for the same reason `extern struct S s;` is valid - `void` is
+- `extern const void x;` is valid a valid declaration in C for the same reason `extern struct S s;` is valid - `void` is
   an incomplete type
   - This is not valid in C++ because incomplete types in general are not allowed in extern declarations, incomplete
     class types are specifically explicitly permitted in [[dcl.stc]/7](https://eel.is/c++draft/dcl.stc#7)