[CONFSERVER-56218] Shell code content within code block macro is rendered as a link

Shell code content within code block macro is rendered as a link

Confluence 6.9.0 Linux 64bit, postgresql9.5, all supported browsers (firefox/chrome IE11, Microsoft edge)

1) create new code block macro
2) add following code to the code block macro:

HOME=/home/oracle
./impdp_flexnet.sh

Content of code block macro is rendered as block of /text

line

./impdp_flexnet.sh

will be rendered as a link to non-existing page

Issue is not reproducible on older Confluence version 6.5.0.
When using following css customization, line ./impdp_flexnet.sh will be highlighted as a link
```
.wiki-content a 
{   text-decoration: underline  !important;   }
```

* There is no difference in page storage format between versions 6.5.0 and 6.9.0
After adding "bash" syntax highliing bug is not visible anymore
Replication steps recording:
http://recordit.co/vM7KIrPpIq

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