Anthony Bryan's man page cleanup in language and spelling

docs/libcurl/curl_easy_pause.3

docs/libcurl/curl_easy_setopt.3

docs/libcurl/curl_formfree.3

docs/libcurl/curl_formget.3

docs/libcurl/curl_getdate.3

docs/libcurl/curl_getenv.3

docs/libcurl/curl_global_init.3

docs/libcurl/curl_mprintf.3

docs/libcurl/curl_multi_assign.3

docs/libcurl/curl_multi_fdset.3

docs/libcurl/curl_multi_info_read.3

docs/libcurl/curl_multi_init.3

docs/libcurl/curl_multi_perform.3

docs/libcurl/curl_multi_setopt.3

docs/libcurl/curl_multi_socket.3

docs/libcurl/curl_share_init.3

docs/libcurl/curl_share_setopt.3

docs/libcurl/curl_strequal.3

docs/libcurl/curl_version_info.3

docs/libcurl/libcurl-errors.3