fix some typos

Signed-off-by: cui fliter <imcusg@gmail.com>

zh-CN/assets/custom3.js

@@ -110,7 +110,7 @@ var initAll = function () {
         pagePath = "index"
     }
 
-    // add vistors count
+    // add visitors count
     var ele = document.createElement("div");
     ele.setAttribute("align","center");
     var count = document.createElement("img")

zh-CN/src/result-panic/panic.md

@@ -16,13 +16,13 @@ fn drink(beverage: &str) {
         __
      }
 
-    println!("Excercise Failed if printing out this line!");
+    println!("Exercise Failed if printing out this line!");
 }
 
 fn main() {
     drink(__);
 
-    println!("Excercise Failed if printing out this line!");
+    println!("Exercise Failed if printing out this line!");
 }
 ```
 

zh-CN/src/unsafe/inline-asm.md

@@ -331,7 +331,7 @@ In some cases, fine control is needed over the way a register name is formatted
 
 By default the compiler will always choose the name that refers to the full register size (e.g. `rax` on x86-64, `eax` on x86, etc).
 
-This default can be overriden by using modifiers on the template string operands, just like you would with format strings:
+This default can be overridden by using modifiers on the template string operands, just like you would with format strings:
 
 ```rust
 use std::arch::asm;