Correct all eggs (#15906)

* "eg" is a misspelled "egg", "e.g." is "exempli gratia"
* Also, "ie" is "i.e.".

compiler/strutils2.nim

@@ -12,7 +12,7 @@ proc dataPointer*[T](a: T): pointer =
   ## same as C++ `data` that works with std::string, std::vector etc.
   ## Note: safe to use when a.len == 0 but whether the result is nil or not
   ## is implementation defined for performance reasons.
-  # this could be improved with ocmpiler support to avoid the `if`, eg in C++
+  # this could be improved with ocmpiler support to avoid the `if`, e.g. in C++
   # `&a[0]` is well defined even if a.size() == 0
   when T is string | seq:
     if a.len == 0: nil else: cast[pointer](a[0].unsafeAddr)