style: standardize markdown list bullets to dashes for consistency

[Earnwithalee7890]

What changed? Why?

This PR standardizes unordered list formatting across the documentation by converting asterisk (*) bullet points to dash (-) bullet points, ensuring consistency with the project's markdown style guide.

Specific changes:

• docs/base-chain/quickstart/base-solana-bridge.mdx - Converted 4 list items from asterisk to dash format

Benefits of standardization:

• Visual consistency - All lists follow the same formatting pattern
• Easier maintenance - Single standard reduces confusion for contributors
• Reduced git noise - Future edits won't include formatting changes mixed with content changes
• Better diff readability - Consistent formatting makes content changes easier to spot

Both * and - are valid markdown for unordered lists, but using a single style throughout the codebase:

• Makes the documentation feel more polished and professional
• Aligns with common markdown best practices
• Follows the project's established style conventions

Notes to reviewers

• This is purely a formatting change; no content was modified
• List items remain semantically identical
• The rendered output is unchanged (both * and - render as bullets)
• Only the markdown source formatting is affected
• Changes maintain proper markdown syntax

How has it been tested?

• Manually verified all list formatting is correct
• Confirmed documentation builds successfully without errors
• Validated that lists render correctly with bullet points
• Checked that no content was altered during the conversion
• Verified git diff shows only the expected bullet character changes

[cb-heimdall]

🟡 Heimdall Review Status

Requirement	Status	More Info
Reviews	🟡 0/2	Denominator calculation Show calculation 1 if user is bot 0 1 if user is external 0 2 if repo is sensitive 0 From .codeflow.yml 1 Additional review requirements Show calculation Max 0 0 From CODEOWNERS 0 Global minimum 0 Max 1 1 1 if commit is unverified 1 Sum 2