Add missing colon to node versioning example

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Overall readability score: 42.47 (🟢 +0)

File	Readability
node-versioning.md	58.13 (🟢 +0)

View detailed metrics

🟢 - Shows an _increase_ in readability 🔴 - Shows a _decrease_ in readability File | Readability | FRE | GF | ARI | CLI | DCRS --- | --- | --- | --- | --- | --- | --- [node-versioning.md](https://github.com/n8n-io/n8n-docs/blob/29c24d38de9158059cf998a79857e9f9c0af8fdd/docs/integrations/creating-nodes/build/reference/node-versioning.md "docs/integrations/creating-nodes/build/reference/node-versioning.md") | 58.13 | 46.37 | 10.9 | 11.4 | 11.48 | 7.71   | 🟢 +0 | 🟢 +0 | 🟢 +0 | 🟢 +0 | 🟢 +0 | 🟢 +0 Averages:   | Readability | FRE | GF | ARI | CLI | DCRS --- | --- | --- | --- | --- | --- | --- Average | 42.47 | 34.34 | 11.76 | 14.99 | 14.43 | 8.59   | 🟢 +0 | 🟢 +0 | 🟢 +0 | 🟢 +0 | 🟢 +0 | 🟢 +0

View metric targets

Metric | Range | Ideal score --- | --- | --- Flesch Reading Ease | 100 (very easy read) to 0 (extremely difficult read) | 60 Gunning Fog | 6 (very easy read) to 17 (extremely difficult read) | 8 or less Auto. Read. Index | 6 (very easy read) to 14 (extremely difficult read) | 8 or less Coleman Liau Index | 6 (very easy read) to 17 (extremely difficult read) | 8 or less Dale-Chall Readability | 4.9 (very easy read) to 9.9 (extremely difficult read) | 6.9 or less