Apply @code{} to two instances of `\book` in NR

[Jason Yip]

In NR 3.2.1 "Structure of a score", 2 references to the `\book` command 
are not in a `@code{}` command in the 2nd last paragraph.


diff --git a/Documentation/en/notation/input.itely 
b/Documentation/en/notation/input.itely
index f7a6ea6..9e7bfd3 100644
--- a/Documentation/en/notation/input.itely
+++ b/Documentation/en/notation/input.itely
@@ -235,7 +235,7 @@ block, and inside or outside the single music 
expression within a
 @code{\score} block.

 Remember that even in a file containing only a @code{\score} block, it
-is implicitly enclosed in a \book block.  A \book block in a source
+is implicitly enclosed in a @code{\book} block.  A @code{\book} block 
in a source
 file produces at least one output file, and by default the name of the
 output file produced is derived from the name of the input file, so
 @file{fandangoforelephants.ly} will produce


--
- Jason Yip

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