Merge pull request #1078 from rpjday/signing

signing.asc: Standardize on using "$" to represent command markup

Author: ben

book/07-git-tools/sections/signing.asc

@@ -22,14 +22,14 @@ If you don't have a key installed, you can generate one with `gpg --gen-key`.
 
 [source,console]
 ----
-gpg --gen-key
+$ gpg --gen-key
 ----
 
 Once you have a private key to sign with, you can configure Git to use it for signing things by setting the `user.signingkey` config setting.
 
 [source,console]
 ----
-git config --global user.signingkey 0A46826A
+$ git config --global user.signingkey 0A46826A
 ----
 
 Now Git will use your key by default to sign tags and commits if you want.