fix minor typo

Signed-off-by: Sukey <[email protected]>

CONTRIBUTING.md

@@ -20,7 +20,7 @@ snarkVM is a big project, so (non-)adherence to best practices related to perfor
 ### Memory handling
 - if the final size is known, pre-allocate the collections (`Vec`, `HashMap` etc.) using `with_capacity` or `reserve` - this ensures that there are both fewer allocations (which involve system calls) and that the final allocated capacity is as close to the required size as possible
 - create the collections right before they are populated/used, as opposed to e.g. creating a few big ones at the beginning of a function and only using them later on; this reduces the amount of time they occupy memory
-- if an intermediate vector is avoidable, use an `Iterator` instead; most of the time this just amounts to omitting the call to `.collect()` if a single-pass iteraton follows afterwards, or returning an `impl Iterator<Item = T>` from a function when the caller only needs to iterate over that result once
+- if an intermediate vector is avoidable, use an `Iterator` instead; most of the time this just amounts to omitting the call to `.collect()` if a single-pass iteration follows afterwards, or returning an `impl Iterator<Item = T>` from a function when the caller only needs to iterate over that result once
 - when possible, fill/resize collections "in bulk" instead of pushing a single element in a loop; this is usually (but not always) detected by `clippy`, suggesting to create vectors containing a repeated value with `vec![x; N]` or extending them with `.resize(N, x)`
 - when a value is to eventually be consumed in a chain of function calls, pass it by value instead of by reference; this has the following benefits:
   * it makes the fact that the value is needed by value clear to the caller, who can then potentially reclaim it from the object afterwards if it is "heavy", limiting allocations