Minor docs changes (microsoft#252)

README.md

@@ -137,8 +137,8 @@ We recommend you specify exact versions of lint libraries, including `tslint-mic
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         Detects usages of child_process and especially child_process.exec() with a non-literal first argument.
-        It is dangerous to pass a string constructed at runtime as the first argument to the child_process.exec().
-        <code>child_process.exec(cmd)</code> runs <code>cmd</code> as a shell command which allows attacker to execute malicious code injected into <code>cmd</code> string.
+        It is dangerous to pass a string constructed at runtime as the first argument to the <code>child_process.exec()</code>.
+        <code>child_process.exec(cmd)</code> runs <code>cmd</code> as a shell command which could allow an attacker to execute malicious code injected into <code>cmd</code>.
         Instead of <code>child_process.exec(cmd)</code> you should use <code>child_process.spawn(cmd)</code> or specify the command as a literal, e.g. <code>child_process.exec('ls')</code>.
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       <td>@next</td>