gcc.mk: Simplify language in comments

Simplify "shipped with" to "in", partly to move focus to what is for
each released, rather than some initial state.

Catch up with NetBSD 10 actually existing.

(Comment only change, and not substantive.)

mk/compiler/gcc.mk

@@ -1,4 +1,4 @@
-# $NetBSD: gcc.mk,v 1.275 2024/03/19 23:22:50 nia Exp $
+# $NetBSD: gcc.mk,v 1.276 2024/06/07 10:49:54 gdt Exp $
 #
 # This is the compiler definition for the GNU Compiler Collection.
 #
@@ -157,20 +157,20 @@ GCC_REQD+=	2.8.0
 # Most of the time, GCC adds support for features of new C and C++
 # standards incrementally; we define USE_CXX_FEATURES=c++XX as
 # intending to require a compiler that fully supports the standard.
-# We tend towards a gcc version shipped with a NetBSD release, because
+# We tend towards a gcc version included in a NetBSD release, because
 # those are known to work well, and because it is simpler to limit
 # selection to fewer versions.  This tendency is much stronger for C++
 # versions, and less so for c11.
 #
 # Thus we tend to:
-#   - gcc 4.8, shipped with NetBSD 7 
-#   - gcc 5, shipped with NetBSD 8
-#   - gcc 7, shipped with NetBSD 9
-#   - gcc 10, shipped with NetBSD 10
+#   - gcc 4.8, in NetBSD 7 
+#   - gcc 5, in NetBSD 8
+#   - gcc 7, in NetBSD 9
+#   - gcc 10, in NetBSD 10
 #
 # Other systems have different versions, and we note a few:
 #
-#  - gcc 8, shipped with Enterprise Linux 8
+#  - gcc 8, in Enterprise Linux 8
 #
 # Resources:
 # https://gcc.gnu.org/projects/cxx-status.html
@@ -185,21 +185,21 @@ GCC_REQD+=	12
 .endif
 
 .if !empty(USE_CXX_FEATURES:Mc++20)
-# GCC 10 is chosen because it is planned to be shipped with NetBSD 10,
+# GCC 10 is chosen because it is in NetBSD 10,
 # so is fairly battle-hardened with pkgsrc.
 #
 # We hope that it remains OK for most C++20 in the future...
 GCC_REQD+=	10
 .endif
 
 .if !empty(USE_CXX_FEATURES:Mc++17)
-# GCC 7 is chosen because it shipped with NetBSD 9, so is fairly
+# GCC 7 is chosen because it is in NetBSD 9, so is fairly
 # battle-hardened with pkgsrc.
 GCC_REQD+=	7
 .endif
 
 .if !empty(USE_CXX_FEATURES:Mc++14)
-# GCC 5 is chosen because it shipped with NetBSD 8, so is fairly
+# GCC 5 is chosen because it is in NetBSD 8, so is fairly
 # battle-hardened with pkgsrc.
 GCC_REQD+=	5
 .endif
@@ -209,7 +209,7 @@ GCC_REQD+=	5
 # (and there was previously a lot of cargo-culted GCC_REQD in pkgsrc
 # as a result), earlier compiler versions are not so well-tested any more.
 #
-# GCC 4.8 was the version shipped with NetBSD 7 and CentOS 7, so is fairly
+# GCC 4.8 was the version in NetBSD 7 and CentOS 7, so is fairly
 # battle-hardened with pkgsrc.
 #
 # Versions before GCC 4.7 do not accept -std=c++11.
@@ -256,8 +256,8 @@ GCC_REQD+=	5
 .endif
 
 .if !empty(USE_CXX_FEATURES:Mfilesystem)
-# GCC 7 supports filesystem under an experimental header, this is not
-# part of GCC 7 as shipped with NetBSD 9.
+# While GCC 7 supports filesystem under an experimental header, this
+# is not part of GCC 7 as included in NetBSD 9.
 #
 # GCC 8 supports filesystem with explicit linking to the libstdc++fs
 # library, which many packages do not do.