Fix error in non-page table mapping size.

If the page size is 4KiB and the address space is 4GiB, this means there are 1048576 possible pages, each of which use 4 bytes to store an address, meaning space taken is 4MiB not 1MiB.
lorenzo-stoakes · May 14, 2016 · 992a740 · 992a740
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diff --git a/3.md b/3.md
@@ -266,7 +266,7 @@ flags, see the [PAE wikipedia article][PAE] for more details.)
 
 * Virtual memory is divided into separate directories so we can have a 'sparse'
   set of data structures for each process. Each PGD takes up a page of memory
-  (4KiB on i386), rather than the 1MiB it would take to map the whole 4GiB
+  (4KiB on i386), rather than the 4MiB it would take to map the whole 4GiB
   address space if it were only a single list.
 
 ## 3.1 Describing the Page Directory

diff --git a/all.md b/all.md
@@ -913,7 +913,7 @@ flags, see the [PAE wikipedia article][PAE] for more details.)
 
 * Virtual memory is divided into separate directories so we can have a 'sparse'
   set of data structures for each process. Each PGD takes up a page of memory
-  (4KiB on i386), rather than the 1MiB it would take to map the whole 4GiB
+  (4KiB on i386), rather than the 4MiB it would take to map the whole 4GiB
   address space if it were only a single list.
 
 ### 3.1 Describing the Page Directory