fix: update merge doc behavior

[codecov[bot]]

Codecov Report

Patch coverage: 100.00% and project coverage change: +0.05% :tada:

Comparison is base (3fd540f) 93.34% compared to head (4d45dcc) 93.40%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #733 +/- ## ========================================== + Coverage 93.34% 93.40% +0.05% ========================================== Files 95 96 +1 Lines 2660 2667 +7 Branches 640 641 +1 ========================================== + Hits 2483 2491 +8 + Misses 177 176 -1 ``` | [Files Changed](https://app.codecov.io/gh/couchbaselabs/node-ottoman/pull/733?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=couchbaselabs) | Coverage Δ | | |---|---|---| | [src/model/create-model.ts](https://app.codecov.io/gh/couchbaselabs/node-ottoman/pull/733?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=couchbaselabs#diff-c3JjL21vZGVsL2NyZWF0ZS1tb2RlbC50cw==) | `88.88% <100.00%> (ø)` | | | [src/model/document.ts](https://app.codecov.io/gh/couchbaselabs/node-ottoman/pull/733?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=couchbaselabs#diff-c3JjL21vZGVsL2RvY3VtZW50LnRz) | `100.00% <100.00%> (ø)` | | | [src/query/helpers/builders.ts](https://app.codecov.io/gh/couchbaselabs/node-ottoman/pull/733?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=couchbaselabs#diff-c3JjL3F1ZXJ5L2hlbHBlcnMvYnVpbGRlcnMudHM=) | `98.34% <100.00%> (ø)` | | | [src/utils/merge.ts](https://app.codecov.io/gh/couchbaselabs/node-ottoman/pull/733?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=couchbaselabs#diff-c3JjL3V0aWxzL21lcmdlLnRz) | `100.00% <100.00%> (ø)` | | ... and [1 file with indirect coverage changes](https://app.codecov.io/gh/couchbaselabs/node-ottoman/pull/733/indirect-changes?src=pr&el=tree-more&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=couchbaselabs)

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