Merge pull request progit#1049 from danstur/fix-1047

Fix incorrect note about PowerShell quoting.

Author: ben

book/10-git-internals/sections/objects.asc

@@ -149,9 +149,10 @@ $ git cat-file -p 99f1a6d12cb4b6f19c8655fca46c3ecf317074e0
 ====
 Depending on what shell you use, you may encounter errors when using the `master^{tree}` syntax.
 
-In PowerShell or CMD on Windows, the `^` character is used for escaping, so you have to double it to avoid this: `git cat-file -p master^^{tree}`.
+In CMD on Windows, the `^` character is used for escaping, so you have to double it to avoid this: `git cat-file -p master^^{tree}`. 
+When using PowerShell, parameters using {} characters have to be quoted to avoid the parameter being parsed incorrectly: `git cat-file -p 'master^{tree}'`.
 
-If you're using ZSH, the `^` character is used for globbing, so you have to enclose the whole expression in quotes: `git cat-file -p "master^{tree}"`
+If you're using ZSH, the `^` character is used for globbing, so you have to enclose the whole expression in quotes: `git cat-file -p "master^{tree}"`.
 ====
 
 Conceptually, the data that Git is storing looks something like this: