Fix name of pallet_multisig

[maltekliemann]

Unfortunately, it's currently not possible to use multisigs via polkadot-js (see the screenshot below).

The problem is solved by renaming the identifier of pallet_multisig from MultiSig to Multisig.

[codecov-commenter]

Codecov Report

Merging #965 (fb2d260) into main (45edad6) will not change coverage.
The diff coverage is n/a.

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@@           Coverage Diff           @@
##             main     #965   +/-   ##
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  Coverage   94.39%   94.39%           
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  Files          93       93           
  Lines       21060    21060           
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  Hits        19880    19880           
  Misses       1180     1180           

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tests	94.39% <ø> (ø)

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[sea212]

Good discovery. Interesting. The technical committee page works the same way, it requires a specific name in the runtime. Wondering if other pallets are still affected by this.