message: [vcpkg] fix typos in error messages
diff: @@ -583,7 +583,7 @@ namespace vcpkg
  candidates, [&](const Toolset* t) { return *tsv == t->version && *vsp == t->visual_studio_root_path; });
  Checks::check_exit(VCPKG_LINE_INFO,
  !candidates.empty(),
  - "Could not find Visual Studio instace at %s with %s toolset.",
  + "Could not find Visual Studio instance at %s with %s toolset.",
  vsp->u8string(),
  *tsv);
  @@ -595,7 +595,7 @@ namespace vcpkg
  {
  Util::stable_keep_if(candidates, [&](const Toolset* t) { return *tsv == t->version; });
  Checks::check_exit(
  - VCPKG_LINE_INFO, !candidates.empty(), "Could not find Visual Studio instace with %s toolset.", *tsv);
  + VCPKG_LINE_INFO, !candidates.empty(), "Could not find Visual Studio instance with %s toolset.", *tsv);
  }
  if (vsp)
  @@ -605,7 +605,7 @@ namespace vcpkg
  [&](const Toolset* t) { return vs_root_path == t->visual_studio_root_path; });
  Checks::check_exit(VCPKG_LINE_INFO,
  !candidates.empty(),
  - "Could not find Visual Studio instace at %s.",
  + "Could not find Visual Studio instance at %s.",
  vs_root_path.generic_string());
  }
  