fix some typos ; mostly in graphs · sagemath/sage@e502730

sage/algebras/steenrod/steenrod_algebra_mult.py:786:13: PLR1704 Redefining argument with the local name `c`

sage/arith/all.py:33:1: PLC2401 Variable name `σ` contains a non-ASCII character

sage/calculus/calculus.py:1115:13: PLR1704 Redefining argument with the local name `bits`

sage/calculus/calculus.py:1120:17: PLR1704 Redefining argument with the local name `degree`

sage/calculus/desolvers.py:1689:35: PLR1704 Redefining argument with the local name `ivar`

sage/categories/pushout.py:1412:47: PLR2044 Line with empty comment

sage/combinat/bijectionist.py:1792:21: PLR1704 Redefining argument with the local name `p`

sage/combinat/cluster_algebra_quiver/mutation_type.py:1490:17: PLR1704 Redefining argument with the local name `k`

sage/combinat/designs/incidence_structures.py:2081:17: PLR1704 Redefining argument with the local name `k`

sage/combinat/diagram_algebras.py:4809:37: PLR1736 List index lookup in `enumerate()` loop

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