remove the star signs

hws/07_search_engine/README.md

@@ -271,7 +271,7 @@ if (lastSlashPos != std::string::npos) {
 - erase: when doing a phrase search, we enclose our query with double quotes. Unfortunately, the autograder is not smart enough to handle this, and it will pass the double quotes as a part of the query string. And therefore, in your program, you need to remove the double quotes, and you can do so using code like this:
 
 ```cpp
-// here tmpString is a string which might contain one double quote character, for example, tmpString might be *"Tom*, or it might be *Cruise"*.
+// here tmpString is a string which might contain one double quote character, for example, tmpString might be "Tom, or it might be Cruise".
 size_t quotePos;
 // unfortunately, autograder will pass \" to the command line, and thus the double quote will be a part of the string.
 if( (quotePos = tmpString.find('"')) != std::string::npos ){