Replace splitting tag in git log

Replacing the (nu) tag allows removing the quotes from the formatting string.
The new command works in both linux and windows systems.
Discussion in nushell/nushell#2730

cookbook/git.md

@@ -20,7 +20,7 @@ Deleted branch post-argument-positions (was 9d34ec9).
 
 Parse formatted commit messages (more details in the parsing git log section)
 
-`git log "--pretty=format:%h(nu)%aN(nu)%s(nu)%aD" | lines | split column "(nu)" sha1 committer desc merged_at | first 10`
+`git log --pretty=%h»¦«%aN»¦«%s»¦«%aD | lines | split column "»¦«" sha1 committer desc merged_at | first 10`
 
 
 Output
@@ -46,7 +46,7 @@ Output
 
 ### View git comitter activity as a `histogram`
 
-`git log "--pretty=format:%h(nu)%aN(nu)%s(nu)%aD" | lines | split column "(nu)" sha1 committer desc merged_at | histogram committer merger | sort-by merger | reverse`
+`git log --pretty=%h»¦«%aN»¦«%s»¦«%aD | lines | split column "»¦«" sha1 committer desc merged_at | histogram committer merger | sort-by merger | reverse`
 
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