Update shifting operations guidelines in expressions.rst (#244)

* Update shifting operations guidelines in expressions.rst

Clarify rules for shifting operations in Rust, emphasizing the importance of using checked functions and addressing inconsistent behavior in different compilation modes.

* Update expressions.rst

* Revise integer shift guidelines and pointer conversion

Updated guidelines on integer shifts and pointer conversions, changing categories and clarifying examples.

* Update expressions.rst

interim commit

* Update expressions.rst

some more progress

* Clarify guideline on out-of-range shifts

Updated guideline to clarify the definition of out-of-range shifts in shift left and shift right expressions. Adjusted references and descriptions to enhance clarity and accuracy.

* Update src/coding-guidelines/expressions.rst

Co-authored-by: Félix Fischer <[email protected]>

* Update shift expressions guidelines and examples

* Update expressions.rst

still thinking about these two shift rules

* Revise shift operation guidelines and examples

Updated guidelines for shift operations to clarify compliance and non-compliance examples. Improved explanations and corrected typographical errors.

* Fix spelling errors in expressions.rst

* Add non-compliant example for bit shifting

Added a non-compliant example demonstrating the use of bits.unbounded_shr(sh) and its implications.

* Update expressions.rst

* fix: make build pass

- make indentation consistent
- make links anonymous so they don't clash
- deduplicate 🆔's

* Update expressions.rst

swapped names of the shift rules

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Co-authored-by: Félix Fischer <[email protected]>
Co-authored-by: Pete LeVasseur <[email protected]>

Author: 3 people