fix clippy warning

[jstarry]

Problem

Warning popped up after 2c0861e

warning: link reference defined in list item                                                                                                                                                                          
    --> ledger/src/blockstore.rs:1208:13                                                                                                                                                                              
     |                                                                                                                                                                                                                
1208 |     ///   - [`cf::Index`]: stores (slot id, index to the index_working_set_entry)                                                                                                                              
     |             ^^^^^^^^^^^^^                                                                                                                                                                                      
     |                                                                                                                                                                                                                
     = help: link definitions are not shown in rendered documentation                                                                                                                                                 
     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#doc_nested_refdefs                                                                                               
     = note: `#[warn(clippy::doc_nested_refdefs)]` on by default                                                                                                                                                      
help: for an intra-doc link, add `[]` between the label and the colon                                                                                                                                                 
     |                                                                                                                                                                                                                
1208 |     ///   - [`cf::Index`][]: stores (slot id, index to the index_working_set_entry)                                                                                                                            
     |                          ++                                                                                                                                                                                    
                                                                                                                                                                                                                      
warning: `solana-ledger` (lib) generated 1 warning                                                                                                                                                                    

Summary of Changes

Fix warning

Fixes #

[jstarry]

Kinda interesting that clippy only complained about one instance of this pattern. Rather than "fixing" all instances, I just fixed the one clippy complained about. From the issue it seems that not all nested items will be rendered as a link reference: rust-lang/rust#133150

[steviez]

Kinda interesting that clippy only complained about one instance of this pattern. Rather than "fixing" all instances, I just fixed the one clippy complained about ...

I also find this kind of bizarre, but agree with your decision to only fix what clippy complained about

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 83.3%. Comparing base (fca33f0) to head (c781ff0).
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff            @@
##           master    #5442     +/-   ##
=========================================
- Coverage    83.3%    83.3%   -0.1%     
=========================================
  Files         820      820             
  Lines      371809   371809             
=========================================
- Hits       310084   310043     -41     
- Misses      61725    61766     +41     

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