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almost identical. * Merge strchr(3) and strrchr(3) to strchr(3) since the two functions are almost identical. * Make the wording of index(3) and strchr(3) more similar. * mdoc(7) cleanup. Submitted by: SUZUKI Koichi <metal@gc5.so-net.ne.jp>, keramida, myself PR: docs/32054 Reviewed by: ru Approved by: ceri (mentor)