docs: minor typo fixes (#471)

Author: badmonster0

docs/docs/core/basics.md

@@ -11,7 +11,7 @@ CocoIndex is an ETL framework for building indexes from specified data sources,
 
 ## Indexing flow
 
-An indexing flow extracts data from speicfied data sources, upon specified transformations, and puts the transformed data into specified storage for later retrieval.
+An indexing flow extracts data from specified data sources, upon specified transformations, and puts the transformed data into specified storage for later retrieval.
 
 An indexing flow has two aspects: data and operations on data.
 

src/execution/source_indexer.rs

@@ -96,7 +96,7 @@ impl SourceIndexingContext {
             } else if let Some(value) = value {
                 Some(value)
             } else {
-                // Even if the source version kind is not Deleted, the source value might be gone one polling.
+                // Even if the source version kind is not Deleted, the source value might be gone when polling.
                 // In this case, we still use the current source version even if it's already stale - actually this version skew
                 // also happens for update cases and there's no way to keep them always in sync for many sources.
                 //