Fix xml method description when dictionary args present

[smbecker]

Fixes issue where XML method descriptions could not be retrieved when the method included a Dictionary as one of the parameters.

Closes #7764

[CLAassistant]

All committers have signed the CLA.

[michaelstaib]

[smbecker]

Should be fixed

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 74.33%. Comparing base (98c8879) to head (4becbd1). Report is 1 commits behind head on main.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #7765 +/- ## ========================================== - Coverage 74.33% 74.33% -0.01% ========================================== Files 2860 2860 Lines 149841 149842 +1 Branches 17411 17411 ========================================== - Hits 111389 111379 -10 - Misses 32655 32667 +12 + Partials 5797 5796 -1 ``` | [Flag](https://app.codecov.io/gh/ChilliCream/graphql-platform/pull/7765/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=ChilliCream) | Coverage Δ | | |---|---|---| | [unittests](https://app.codecov.io/gh/ChilliCream/graphql-platform/pull/7765/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=ChilliCream) | `74.33% <ø> (-0.01%)` | :arrow_down: | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=ChilliCream#carryforward-flags-in-the-pull-request-comment) to find out more.

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