Added b to open modes (#22196)

* Added b to open modes

Added the binary mode to the different modes of opening a file

* Fixed formatting

guide/english/c/file-handling/index.md

@@ -62,6 +62,7 @@ C provides a number of build-in function to perform basic file operation
   ```
   
   In C there are many mode for opening a file 
+  
   **r**  **-**   **open a file in reading mode**
   ..//Provide access only to read a file but not to write it.
   
@@ -77,6 +78,8 @@ C provides a number of build-in function to perform basic file operation
   
   **w+**  **-**   **opens a file in both reading and writing mode**
   
+  **b**  **-**   **opens a file in binary mode**
+  
   Here's an  example of reading and writing data to a file
   
   ```c