chore: update OperationBuilder documentation now that an Option is no longer passed.

Signed-off-by: Tomas Fabrizio Orsi <tomas.orsi@lambdaclass.com>

Author: lima-limon-inc

hir-macros/src/operation.rs

@@ -56,7 +56,7 @@ pub struct OpDefinition {
     /// Indicates whether the current operation could belong to a [`SymbolTable`].
     ///
     /// If true, this operation's builder will have an additional parameter of type
-    ///`parent_symbol_table: Option<&mut SymbolTableRef>`. `None` is currently only used in testing.
+    ///`parent_symbol_table: &mut SymbolTableRef`.
     belongs_in_symbol_table: bool,
     /// The symbolic references held by this op
     symbols: Vec<Symbol>,