spelling: single

src/lib/config/command-socket.dox

@@ -134,7 +134,7 @@ int main(int argc, const char* argv[]) {
 
 @section ctrlSocketImpl Control Channel Implementation
 
-Control Channel is implemented in @ref isc::config::CommandMgr. It is a signleton
+Control Channel is implemented in @ref isc::config::CommandMgr. It is a singleton
 class that allows registration of callbacks that handle specific commands.
 It internally supports a single command: @c list-commands that returns a list
 of supported commands. This component is expected to be shared among all daemons.

src/lib/dhcpsrv/tests/generic_host_data_source_unittest.h

@@ -351,7 +351,7 @@ public:
     /// - DHCPv6 boot file url option,
     /// - DHCPv6 information refresh time option,
     /// - DHCPv6 vendor option with vendor id 2495,
-    /// - DHCPv6 option 1024, with a sigle IPv6 address,
+    /// - DHCPv6 option 1024, with a single IPv6 address,
     /// - DHCPv6 empty option 1, within isc2 option space,
     /// - DHCPv6 option 2, within isc2 option space with 3 IPv6 addresses,
     ///

src/lib/testutils/io_utils.cc

@@ -85,7 +85,7 @@ std::string decommentJSONfile(const std::string& input_file) {
             if (begin_pos != string::npos) {
                 in_comment = true;
                 if (end_pos != string::npos) {
-                    // sigle line comment. Let's get rid of the content in between
+                    // single line comment. Let's get rid of the content in between
                     line = line.replace(begin_pos, end_pos + 2, end_pos + 2 - begin_pos, ' ');
                     in_comment = false;
                 } else {