Add a missing backquote in NEWS.md (#37345)

Author: sostock

NEWS.md

@@ -83,7 +83,7 @@ Standard library changes
 * `intersect` on `CartesianIndices` now returns `CartesianIndices` instead of `Vector{<:CartesianIndex}` ([#36643]).
 * `push!(c::Channel, v)` now returns channel `c`. Previously, it returned the pushed value `v` ([#34202]).
 * `RegexMatch` objects can now be probed for whether a named capture group exists within it through `haskey()` ([#36717]).
-* For consistency `haskey(r::RegexMatch, i::Integer) has also been added and returns if the capture group for `i` exists ([#37300]).
+* For consistency `haskey(r::RegexMatch, i::Integer)` has also been added and returns if the capture group for `i` exists ([#37300]).
 * A new standard library `TOML` has been added for parsing and printing [TOML files](https://toml.io) ([#37034]).
 
 #### LinearAlgebra