update using-the-compiler.rst with details of optimizer cleanup sequence

Removed duplicate lines and clarified the wording.

Removed trailing whitespace.

Update docs/using-the-compiler.rst

Co-authored-by: matheusaaguiar <[email protected]>

Clarified behaviors.

Updated text to meet suggestions.

Author: andy53

docs/using-the-compiler.rst

@@ -287,8 +287,18 @@ Input Description
               // Improve allocation of stack slots for variables, can free up stack slots early.
               // Activated by default if the Yul optimizer is activated.
               "stackAllocation": true,
-              // Select optimization steps to be applied.
-              // Optional, the optimizer will use the default sequence if omitted.
+              // Select optimization steps to be applied. It is also possible to modify both the
+              // optimization sequence and the clean-up sequence. Instructions for each sequence
+              // are separated with the ":" delimiter and the values are provided in the form of
+              // optimization-sequence:clean-up-sequence. For more information see
+              // "The Optimizer > Selecting Optimizations".
+              // This field is optional, and if not provided, the default sequences for both
+              // optimization and clean-up are used. If only one of the options is provivded
+              // the other will not be run.
+              // If only the delimiter ":" is provided then neither the optimization nor the clean-up
+              // sequence will be run.
+              // If set to an empty value, only the default clean-up sequence is used and
+              // no optimization steps are applied.
               "optimizerSteps": "dhfoDgvulfnTUtnIf..."
             }
           }