Minor fixes for modules (#200)

Author: apolukhin

CMakeLists.txt

@@ -11,8 +11,7 @@ project(boost_pfr VERSION "${BOOST_SUPERPROJECT_VERSION}" LANGUAGES CXX)
 if (BOOST_USE_MODULES)
     add_library(boost_pfr)
     target_sources(boost_pfr PUBLIC
-        FILE_SET modules_public TYPE CXX_MODULES FILES
-            ${CMAKE_CURRENT_LIST_DIR}/modules/pfr.cppm
+        FILE_SET modules_public TYPE CXX_MODULES FILES modules/boost_pfr.cppm
     )
 
     target_compile_features(boost_pfr PUBLIC cxx_std_20)

doc/pfr.qbk

@@ -569,19 +569,19 @@ benifits of modules without changing the existing code.
 [note For better compile times make sure that `import std;` is available when building the `boost.pfr` module (in CMake logs there should be
       a 'Using `import std;`' message). ]
 
-If not using CMake, then the module could be build manually from the `module/pfr.cppm` file.
+If not using CMake, then the module could be build manually from the `modules/boost_pfr.cppm` file.
 
-For manual module build the following commands could be used for clang compiler:
+For manual module build the following commands can be used for clang compiler:
 
 ```
 cd pfr/module
-clang++ -I ../include -std=c++20 --precompile -x c++-module pfr.cppm
+clang++ -I ../include -std=c++20 --precompile -x c++-module boost_pfr.cppm
 ```
 
 After that, the module could be used in the following way:
 
 ```
-clang++ -std=c++20 -fmodule-file=pfr.pcm pfr.pcm usage_sample.cpp
+clang++ -std=c++20 -fmodule-file=boost_pfr.pcm boost_pfr.pcm usage_sample.cpp
 ```
 
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