Update pkg_config_pc_files.rst (#1190)
Update pkg_config_pc_files.rst (#1190)

Change "solve" to "address". Change "to" to "with". Change tense of "packaging".  Change "not needed" to "unneeded". Fix awkward word order. Change "bA" to "A". Add "they".
conan-io/docs,conan-io/docs,conan-io/docs,conan-io/docs