Fix: inaccurate docs

Internally, sizes are always in binary units; this documentation is misleading and implies that they work in decimal units.

Without going through and replacing _every_ "MB" -> "MiB" this is the best way to hint to developers that binary sizes are used.

website/content/docs/job-specification/resources.mdx

@@ -83,11 +83,11 @@ If `cores` and `cpu` are both defined in the same resource block, validation of
 ### Memory
 
 This example specifies the task requires 2 GB of RAM to operate. 2 GB is the
-equivalent of 2000 MB:
+equivalent of 2048 MB:
 
 ```hcl
 resources {
-  memory = 2000
+  memory = 2048
 }
 ```