fixed grammar in a couple of awkward error messages

src/crypto/rx/Rx_linux.cpp

@@ -275,7 +275,7 @@ bool xmrig::Rx::msrInit(const RxConfig &config, const std::vector<CpuThread> &th
     const uint64_t ts = Chrono::steadyMSecs();
 
     if (wrmsr(preset, threads, config.cacheQoS(), config.rdmsr())) {
-        LOG_NOTICE(CLEAR "%s" GREEN_BOLD_S "register values for \"%s\" preset has been set successfully" BLACK_BOLD(" (%" PRIu64 " ms)"), tag, config.msrPresetName(), Chrono::steadyMSecs() - ts);
+        LOG_NOTICE(CLEAR "%s" GREEN_BOLD_S "register values for \"%s\" preset have been set successfully" BLACK_BOLD(" (%" PRIu64 " ms)"), tag, config.msrPresetName(), Chrono::steadyMSecs() - ts);
 
         return true;
     }

src/crypto/rx/Rx_win.cpp

@@ -123,7 +123,7 @@ static HANDLE wrmsr_install_driver()
 
     hService = OpenServiceW(hManager, SERVICE_NAME, SERVICE_ALL_ACCESS);
     if (hService) {
-        LOG_WARN(CLEAR "%s" YELLOW("service ") YELLOW_BOLD("WinRing0_1_2_0") YELLOW(" is already exists"), tag);
+        LOG_WARN(CLEAR "%s" YELLOW("service ") YELLOW_BOLD("WinRing0_1_2_0") YELLOW(" already exists"), tag);
 
         SERVICE_STATUS status;
         const auto rc = QueryServiceStatus(hService, &status);