Kevin Jerome

ch6/ch6-memscan-3 erroneous closing brace prevents compilation

1

As can be seen [here](https://github.com/rust-in-action/code/blob/1st-edition/ch6/ch6-memscan-3/src/main.rs#L20), the extra closing brace prevents compilation. Removing the brace solves the issue.

Figure 6.4 Vec<T> card is mistakingly labeled with Arc<T>

2

The issue can be seen here: 

`MEMORY_BASIC_INFORMATION` is imported on [this line](https://github.com/rust-in-action/code/blob/1st-edition/ch6/ch6-meminfo-win/src/main.rs#L12) as `MEMINFO`, but [this line](https://github.com/rust-in-action/code/blob/1st-edition/ch6/ch6-meminfo-win/src/main.rs#L22) still uses the original import name. Updating line 22 to `MEMINFO` fixes the issue.