fix: metric type inconsistency (#2122)

PR fixes #2113

---------

Co-authored-by: Will Jones <willjones127@gmail.com>

docs/src/js/interfaces/HnswPqOptions.md

@@ -24,18 +24,18 @@ The following distance types are available:
 
 "l2" - Euclidean distance. This is a very common distance metric that
 accounts for both magnitude and direction when determining the distance
-between vectors. L2 distance has a range of [0, ∞).
+between vectors. l2 distance has a range of [0, ∞).
 
 "cosine" - Cosine distance.  Cosine distance is a distance metric
 calculated from the cosine similarity between two vectors. Cosine
 similarity is a measure of similarity between two non-zero vectors of an
 inner product space. It is defined to equal the cosine of the angle
-between them.  Unlike L2, the cosine distance is not affected by the
+between them.  Unlike l2, the cosine distance is not affected by the
 magnitude of the vectors.  Cosine distance has a range of [0, 2].
 
 "dot" - Dot product. Dot distance is the dot product of two vectors. Dot
 distance has a range of (-∞, ∞). If the vectors are normalized (i.e. their
-L2 norm is 1), then dot distance is equivalent to the cosine distance.
+l2 norm is 1), then dot distance is equivalent to the cosine distance.
 
 ***
 

docs/src/js/interfaces/HnswSqOptions.md

@@ -24,18 +24,18 @@ The following distance types are available:
 
 "l2" - Euclidean distance. This is a very common distance metric that
 accounts for both magnitude and direction when determining the distance
-between vectors. L2 distance has a range of [0, ∞).
+between vectors. l2 distance has a range of [0, ∞).
 
 "cosine" - Cosine distance.  Cosine distance is a distance metric
 calculated from the cosine similarity between two vectors. Cosine
 similarity is a measure of similarity between two non-zero vectors of an
 inner product space. It is defined to equal the cosine of the angle
-between them.  Unlike L2, the cosine distance is not affected by the
+between them.  Unlike l2, the cosine distance is not affected by the
 magnitude of the vectors.  Cosine distance has a range of [0, 2].
 
 "dot" - Dot product. Dot distance is the dot product of two vectors. Dot
 distance has a range of (-∞, ∞). If the vectors are normalized (i.e. their
-L2 norm is 1), then dot distance is equivalent to the cosine distance.
+l2 norm is 1), then dot distance is equivalent to the cosine distance.
 
 ***
 

docs/src/js/interfaces/IvfPqOptions.md

@@ -31,13 +31,13 @@ The following distance types are available:
 
 "l2" - Euclidean distance. This is a very common distance metric that
 accounts for both magnitude and direction when determining the distance
-between vectors. L2 distance has a range of [0, ∞).
+between vectors. l2 distance has a range of [0, ∞).
 
 "cosine" - Cosine distance.  Cosine distance is a distance metric
 calculated from the cosine similarity between two vectors. Cosine
 similarity is a measure of similarity between two non-zero vectors of an
 inner product space. It is defined to equal the cosine of the angle
-between them.  Unlike L2, the cosine distance is not affected by the
+between them.  Unlike l2, the cosine distance is not affected by the
 magnitude of the vectors.  Cosine distance has a range of [0, 2].
 
 Note: the cosine distance is undefined when one (or both) of the vectors
@@ -46,7 +46,7 @@ never be returned from a vector search.
 
 "dot" - Dot product. Dot distance is the dot product of two vectors. Dot
 distance has a range of (-∞, ∞). If the vectors are normalized (i.e. their
-L2 norm is 1), then dot distance is equivalent to the cosine distance.
+l2 norm is 1), then dot distance is equivalent to the cosine distance.
 
 ***