"Fix" display of atomic ops

The POD parser chokes due to ops having `=` in them, which are
things to draw the table with.

Fixed by wrapping them in C<>, but the parser doesn't parse those in
tables :(

Author: zoffixznet

doc/Language/unicode_texas.pod6

@@ -118,15 +118,16 @@ Texas equivalents are subroutines, which are as follows:
 
 =table
   Symbol | Texas            | Remarks
-  =======|==================|=========================
-  ⚛=     | atomic-assign    |
-  ⚛      | atomic-fetch     | this is the prefix:<⚛> operator
-  ⚛+=    | atomic-add-fetch |
-  ⚛-=    | atomic-sub-fetch |
-  ++⚛    | atomic-inc-fetch |
-  ⚛++    | atomic-fetch-dec |
-  --⚛    | atomic-dec-fetch |
-  ⚛--    | atomic-fetch-dec |
+  ===============================================================
+  C<⚛=>  | atomic-assign    |
+  C<⚛>   | atomic-fetch     | this is the prefix:<⚛> operator
+  C<⚛+=> | atomic-add-fetch |
+  C<⚛-=> | atomic-sub-fetch |
+  C<⚛−=> | atomic-sub-fetch | this operator uses U+2212 minus sign
+  C<++⚛> | atomic-inc-fetch |
+  C<⚛++> | atomic-fetch-dec |
+  C<--⚛> | atomic-dec-fetch |
+  C<⚛--> | atomic-fetch-dec |
   
 =head1 Multiple codepoints