minor: align the target name in conanfile with the document

Author: kexianda

.gitignore

@@ -5,6 +5,7 @@ build*/
 !.vscode/launch.json
 .gitattributes
 compile_commands.json
+CMakeUserPresets.json
 /*.cpp
 /*.patch
 /*.diff

conanfile.py

@@ -57,4 +57,5 @@ def package(self):
   def package_info(self):
     self.cpp_info.set_property("cmake_file_name", "P2300")
     self.cpp_info.set_property("cmake_target_name", "P2300::P2300")
+    self.cpp_info.set_property("cmake_target_aliases", ["STDEXEC::stdexec"])
     self.cpp_info.libs = ["system_context"]

test_package/CMakeLists.txt

@@ -5,5 +5,5 @@ enable_testing()
 find_package(P2300 REQUIRED)
 
 add_executable(test_stdexec test.cpp)
-target_link_libraries(test_stdexec P2300::P2300)
+target_link_libraries(test_stdexec STDEXEC::stdexec)
 add_test(test_stdexec test_stdexec)