Fix JULIA_SHELL cross-reference

GregPlowman · web-flow · commit 577188853300 · 2017-09-30T16:51:08.000+10:00
diff --git a/doc/src/manual/interacting-with-julia.md b/doc/src/manual/interacting-with-julia.md
@@ -117,7 +117,7 @@ julia> ; # upon typing ;, the prompt changes (in place) to: shell>
 shell> echo hello
 hello
 ```
-See [`JULIA_SHELL`](@ref) in the Environment Variables section of the manual.
+See [JULIA_SHELL](@ref) in the Environment Variables section of the manual.
 
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