docs: fixed grammatical issues in "Blockchain Bridges" section

[indmind]

Description

I noticed a few grammatical errors and awkward phrases in the documentation. Specifically:

1. Changed "Types of bridge" to "Types of bridges" for proper plural usage.
2. Updated "Use bridge" to "Using bridges" to correct the phrasing.
3. Corrected "Risk using bridges" to "Risks of using bridges" for clarity and accuracy.

These changes should improve the readability and correctness of the text.

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