Correct MyHashCompare example in concurrent_hash_map page (uxlfound…

…ation#1339)

Signed off by: Daniel Bashir <[email protected]>

doc/main/tbb_userguide/concurrent_hash_map.rst

@@ -30,14 +30,14 @@ string occurs in the array ``Data``.
 
    // Structure that defines hashing and comparison operations for user's type.
    struct MyHashCompare {
-       static size_t hash( const string& x ) {
+       size_t hash( const string& x ) const {
            size_t h = 0;
            for( const char* s = x.c_str(); *s; ++s )
                h = (h*17)^*s;
            return h;
        }
        //! True if strings are equal
-       static bool equal( const string& x, const string& y ) {
+       bool equal( const string& x, const string& y ) const {
            return x==y;
        }
    };
@@ -128,4 +128,4 @@ any other extant accesses on ``key``.
 .. toctree::
    :maxdepth: 4
 
-   ../tbb_userguide/More_on_HashCompare
+   ../tbb_userguide/More_on_HashCompare