[bugfix]components:libc:cplusplus: Repair the comment code.

os:cxx_Thread.c
The word at beginning of the comment on line 104 is capitalized.
utest:tc_thread.cpp
1. A space has been added before the comment end symbol in lines 33,36,51.
2. Remove trailing spaces to comply with the rtthread encoding standard
in lines 21,27,34,39,44,48.
signed-off-by: Liu Chengtao<2739960959@qq.com>

Author: lct1001

components/libc/cplusplus/os/cxx_Thread.cpp

@@ -101,7 +101,7 @@ void Thread::sleep(int32_t millisec)
 }
 
 /** 
- * @brief function to run the thread's entry function.
+ * @brief Function to run the thread's entry function.
  */
 void Thread::func(Thread *pThis)
 {

components/libc/cplusplus/utest/tc_thread.cpp

@@ -18,37 +18,37 @@
  */
 static void test_thread(void)
 {
-    int count = 0; 
+    int count = 0;
 
-    /* Lambda function to increment the count.*/
+    /* Lambda function to increment the count. */
     auto func = [&]() mutable {
         for (int i = 0; i < 100; ++i)
         {
-            ++count; 
+            ++count;
         }
     };
 
     /* Create and run a thread executing the lambda function. */
     std::thread t1(func);
-    /* Wait for the thread to finish execution.*/
-    t1.join();  
+    /* Wait for the thread to finish execution. */
+    t1.join();
 
-    /* Verify if the count is as expected after the first thread execution.*/
+    /* Verify if the count is as expected after the first thread execution. */
     if (count != 100)
     {
-        uassert_false(1);  
+        uassert_false(1);
     }
 
     /* Create and run another thread executing the same lambda function. */
     std::thread t2(func);
-    t2.join();  
+    t2.join();
 
     if (count != 200)
     {
-        uassert_false(1);  
+        uassert_false(1);
     }
 
-    /* If both assertions passed, the test is successful.*/
+    /* If both assertions passed, the test is successful. */
     uassert_true(1);
 }