mistype on ebpf_past_present_future.md

[pedrofausto]

Item 2 from "eBPF and Linux: The Present" section got a duplicated word, as follow:
"Loading the program into the kernel and creating necessary eBPF-maps. This is done using the bpf syscall in Linux. This syscall allows for the byte code to be loaded along with a declaration of the the type of eBPF program that’s being loaded"

Just a small contribution. Thx for your work.