Improve wording in migration guide #413

Job	Run time
Run static checkers	41s
Installation tests	14s
macOS	54s
Build for 32-bit	32s
Build with make	2m 34s
Build with CMake [Release, gcc-14, cmake-3.29, sanitizer=""]	2m 43s
Build with CMake [Release, gcc-14, cmake-3.29, sanitizer="thread"]	3m 0s
Windows	6m 13s
Windows (MinGW64)	56s
Build with CMake [Release, gcc-14, cmake-3.29, sanitizer="undefined"]	2m 44s
Build with CMake [Release, gcc-14, cmake-3.29, sanitizer="leak"]	2m 42s
Build with CMake [Release, gcc-14, cmake-3.29, sanitizer="address"]	2m 59s
Build with CMake [Release, clang-18, cmake-3.29, sanitizer=""]	3m 0s
Build with CMake [Release, clang-18, cmake-3.29, sanitizer="thread"]	3m 11s
Build with CMake [Release, clang-18, cmake-3.29, sanitizer="undefined"]	3m 2s
Build with CMake [Release, clang-18, cmake-3.29, sanitizer="leak"]	2m 52s
Build with CMake [Release, clang-18, cmake-3.29, sanitizer="address"]	3m 12s
Build with CMake [Debug, clang-18, cmake-3.29, sanitizer=""]	2m 59s
Build with CMake [Release, gcc-7, cmake-3.13, sanitizer=""]	4m 21s
Build with CMake [Release, clang-12, cmake-3.13, sanitizer=""]	5m 48s
	54m 37s

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