cil_conditional_statements.md: fix expr definition

expr "(expr (tunable_id tunable_id))" does not work but "(expr
tunable_id tunable_id)" does work

for example, this works

(tunable test1)
(tunable test2)
(tunableif (or test1 test2)
	   (true
	    (allow a b (c (d)))))

but this does not work:

(tunable test1)
(tunable test2)
(tunableif (or (test1 test2))
	   (true
	    (allow a b (c (d)))))

Signed-off-by: Dominick Grift <dominick.grift@defensec.nl>

secilc/docs/cil_conditional_statements.md

@@ -78,12 +78,12 @@ Contains the run time conditional statements that are instantiated in the binary
 <tr class="odd">
 <td align="left"><p><code>expr</code></p></td>
 <td align="left"><p>Zero or more <code>expr</code>'s, the valid operators and syntax are:</p>
-<p><code>    (and (boolean_id boolean_id))</code></p>
-<p><code>    (or  (boolean_id boolean_id))</code></p>
-<p><code>    (xor (boolean_id boolean_id))</code></p>
-<p><code>    (eq  (boolean_id boolean_id))</code></p>
-<p><code>    (neq (boolean_id boolean_id))</code></p>
-<p><code>    (not (boolean_id))</code></p></td>
+<p><code>    (and boolean_id boolean_id)</code></p>
+<p><code>    (or  boolean_id boolean_id)</code></p>
+<p><code>    (xor boolean_id boolean_id)</code></p>
+<p><code>    (eq  boolean_id boolean_id)</code></p>
+<p><code>    (neq boolean_id boolean_id)</code></p>
+<p><code>    (not boolean_id)</code></p></td>
 </tr>
 <tr class="even">
 <td align="left"><p><code>true</code></p></td>
@@ -196,12 +196,12 @@ Compile time conditional statement that may or may not add CIL statements to be
 <tr class="odd">
 <td align="left"><p><code>expr</code></p></td>
 <td align="left"><p>Zero or more <code>expr</code>'s, the valid operators and syntax are:</p>
-<p><code>    (and (tunable_id tunable_id))</code></p>
-<p><code>    (or  (tunable_id tunable_id))</code></p>
-<p><code>    (xor (tunable_id tunable_id))</code></p>
-<p><code>    (eq  (tunable_id tunable_id))</code></p>
-<p><code>    (neq (tunable_id tunable_id))</code></p>
-<p><code>    (not (tunable_id))</code></p></td>
+<p><code>    (and tunable_id tunable_id)</code></p>
+<p><code>    (or  tunable_id tunable_id)</code></p>
+<p><code>    (xor tunable_id tunable_id)</code></p>
+<p><code>    (eq  tunable_id tunable_id)</code></p>
+<p><code>    (neq tunable_id tunable_id)</code></p>
+<p><code>    (not tunable_id)</code></p></td>
 </tr>
 <tr class="even">
 <td align="left"><p><code>true</code></p></td>