[skip ci]Improve proxy doc grammar (#12124)

Signed-off-by: tumao <yan.wang@zilliz.com>

docs/design_docs/milvus_meta_snapshot_en.md

@@ -98,7 +98,7 @@ type SnapShotKV interface {
 
 For the `Read` operations (`Load` and `LoadWithPrefix`), the input parameter `typeutil.Timestamp` is used to tell `metaSnapShot` to load the value based on that `Timestamp`.
 
-For the `Write` operations (`Save`, `MultiSave`, `MultiSaveAndRemoveWithPrefix`), return values include `typeutil.Timestamp`, which is used to tell the caller when these write operations happened.
+For the `Write` operations (`Save`, `MultiSave`, `MultiSaveAndRemoveWithPrefix`), return values including `typeutil.Timestamp`, which is used to tell the caller when these write operations happened.
 
 You might be curious about the parameter `additions` of `MultiSave` and `MultiSaveAndRemoveWithPrefix`: What does `additions` do, and why?
 

docs/design_docs/proxy.md

@@ -389,12 +389,12 @@ type channelsMgr interface {
 }
 ```
 
-- getChannels 和 getVChannels
+- getChannels and getVChannels
 
   getVChannels returns a list that represents all virtual DmChannels of collection, getChannels returns a list that
   represents all physical DmChannels of collection. The two lists correspond one-to-one according to position.
 
-- createDMLStream 和 getDMLStream
+- createDMLStream and getDMLStream
 
   createDMLStream creates the dml message stream of collection;
 
@@ -402,7 +402,7 @@ type channelsMgr interface {
 
   Proxy uses these dml message stream to write dml data, such as insert request.
 
-- createDQLStream 和 getDQLStream
+- createDQLStream and getDQLStream
 
   createDQLStream creates the dql message stream of collection;
 
@@ -429,7 +429,7 @@ type channelsTimeTicker interface {
 }
 ```
 
-- addPChan 和 removePChan
+- addPChan and removePChan
 
   addPChan adds a physical channel to channelsTimeTicker, channelsTimeTicker only sends the information of existing
   pChans to Root Coordinator;