patch 8.2.3914: various spelling mistakes in comments

Problem:    Various spelling mistakes in comments.
Solution:   Fix the mistakes. (Dominique Pellé, closes #9416)
diff --git a/src/os_mswin.c b/src/os_mswin.c
index b6393db..26042b4 100644
--- a/src/os_mswin.c
+++ b/src/os_mswin.c
@@ -1907,7 +1907,7 @@
 # define VIM_CLASSNAME      "VIM_MESSAGES"
 # define VIM_CLASSNAME_LEN  (sizeof(VIM_CLASSNAME) - 1)
 
-// Communication is via WM_COPYDATA messages. The message type is send in
+// Communication is via WM_COPYDATA messages. The message type is sent in
 // the dwData parameter. Types are defined here.
 # define COPYDATA_KEYS		0
 # define COPYDATA_REPLY		1
@@ -2375,7 +2375,7 @@
 	return sendToLocalVim(cmd, asExpr, result);
 
     // If the server name does not end in a digit then we look for an
-    // alternate name.  e.g. when "name" is GVIM the we may find GVIM2.
+    // alternate name.  e.g. when "name" is GVIM then we may find GVIM2.
     if (STRLEN(name) > 1 && !vim_isdigit(name[STRLEN(name) - 1]))
 	altname_buf_ptr = altname_buf;
     altname_buf[0] = NUL;