doc: Fix typos

libraries/doc/Doxyfile

@@ -292,7 +292,7 @@ TYPEDEF_HIDES_STRUCT   = NO
 # causing a significant performance penality. 
 # If the system has enough physical memory increasing the cache will improve the 
 # performance by keeping more symbols in memory. Note that the value works on 
-# a logarithmic scale so increasing the size by one will rougly double the 
+# a logarithmic scale so increasing the size by one will roughly double the 
 # memory usage. The cache size is given by this formula: 
 # 2^(16+SYMBOL_CACHE_SIZE). The valid range is 0..9, the default is 0, 
 # corresponding to a cache size of 2^16 = 65536 symbols