Tweak "isn't / is" for conciseness

Author: hsutter

Diff for: README.md

@@ -18,7 +18,7 @@ Elaborating:
 
 **What it isn't.** Cpp2 is not a successor or alternate language with its own divergent or incompatible ecosystem. For example, it does not have its own nonstandard incompatible modules/concepts/etc. that compete with the Standard C++ features; it does not replace your Standard C++ compiler or other tools; and it does not require any changes to your Standard C++ compiler or standard library or other libraries or tools to keep fully using all of them.
 
-**What it is.** Cpp2 aims to be another "skin" for C++ itself, just a simpler and safer way to write ordinary C++ types/functions/objects, and a faster way to experiment with proposals for future new Standard C++ features in a simpler compiler and syntax flavor. It seamlessly uses Standard C++ modules and concepts requirements and other features, and it works with all existing C++20 or higher compilers and libraries and tools right out of the box with no changes required (and therefore no ABI changes required) to use them all seamlessly and directly with zero overhead.
+**What it is.** Cpp2 aims to be another "skin" for C++ itself, just a simpler and safer way to write ordinary C++ types/functions/objects, and a faster way to experiment with proposals for future new Standard C++ features in a simpler compiler and syntax flavor. It seamlessly uses Standard C++ modules and concepts requirements and other features, and it works with all existing C++20 or higher compilers and libraries and tools right out of the box with no changes required to use them all seamlessly and directly with zero overhead.
 
 For more, see [What is Cpp2?](https://hsutter.github.io/cppfront/#what-is-cpp2).
 

Diff for: docs/index.md

@@ -13,7 +13,7 @@ main: () = {
 
 **What it isn't.** Cpp2 is not a successor or alternate language with its own divergent or incompatible ecosystem. For example, it does not have its own nonstandard incompatible modules/concepts/etc. that compete with the Standard C++ features; it does not replace your Standard C++ compiler or other tools; and it does not require any changes to your Standard C++ compiler or standard library or other libraries or tools to keep fully using all of them.
 
-**What it is.** Cpp2 aims to be another "skin" for C++ itself, just a simpler and safer way to write ordinary C++ types/functions/objects, and a faster way to experiment with proposals for future new Standard C++ features in a simpler compiler and syntax flavor. It seamlessly uses Standard C++ modules and concepts requirements and other features, and it works with all existing C++20 or higher compilers and libraries and tools right out of the box with no changes required (and therefore no ABI changes required) to use them all seamlessly and directly with zero overhead.
+**What it is.** Cpp2 aims to be another "skin" for C++ itself, just a simpler and safer way to write ordinary C++ types/functions/objects, and a faster way to experiment with proposals for future new Standard C++ features in a simpler compiler and syntax flavor. It seamlessly uses Standard C++ modules and concepts requirements and other features, and it works with all existing C++20 or higher compilers and libraries and tools right out of the box with no changes required to use them all seamlessly and directly with zero overhead.
 
  Bjarne Stroustrup said it best: