Change gendered terms to be gender-neutral (#21325)

Some typos are also fixed.

src/core/manager.h

@@ -195,7 +195,7 @@ struct Manager {
 
         sd_event *event;
 
-        /* This maps PIDs we care about to units that are interested in. We allow multiple units to he interested in
+        /* This maps PIDs we care about to units that are interested in. We allow multiple units to be interested in
          * the same PID and multiple PIDs to be relevant to the same unit. Since in most cases only a single unit will
          * be interested in the same PID we use a somewhat special encoding here: the first unit interested in a PID is
          * stored directly in the hashmap, keyed by the PID unmodified. If there are other units interested too they'll

src/hostname/hostnamectl.c

@@ -442,7 +442,7 @@ static int set_hostname(int argc, char **argv, void *userdata) {
                  * dot if there is one. If it was not valid, then it will be made fully valid by truncating, dropping
                  * multiple dots, and dropping weird chars. Note that we clean the name up only if we also are
                  * supposed to set the pretty name. If the pretty name is not being set we assume the user knows what
-                 * he does and pass the name as-is. */
+                 * they are doing and pass the name as-is. */
                 h = strdup(hostname);
                 if (!h)
                         return log_oom();

src/libsystemd/sd-bus/bus-socket.c

@@ -301,8 +301,8 @@ static int verify_external_token(sd_bus *b, const char *p, size_t l) {
         uid_t u;
         int r;
 
-        /* We don't do any real authentication here. Instead, we if
-         * the owner of this bus wanted authentication he should have
+        /* We don't do any real authentication here. Instead, if 
+         * the owner of this bus wanted authentication they should have
          * checked SO_PEERCRED before even creating the bus object. */
 
         if (!b->anonymous_auth && !b->ucred_valid)

src/libsystemd/sd-bus/sd-bus.c

@@ -3283,7 +3283,7 @@ static int bus_poll(sd_bus *bus, bool need_more, uint64_t timeout_usec) {
                         return e;
 
                 if (need_more)
-                        /* The caller really needs some more data, he doesn't
+                        /* The caller really needs some more data, they don't
                          * care about what's already read, or any timeouts
                          * except its own. */
                         e |= POLLIN;

src/udev/dmi_memory_id/dmi_memory_id.c

@@ -539,7 +539,7 @@ static void dmi_table_decode(const uint8_t *buf, size_t len, uint16_t num) {
 
                 /* If a short entry is found (less than 4 bytes), not only it
                  * is invalid, but we cannot reliably locate the next entry.
-                 * Better stop at this point, and let the user know his/her
+                 * Better stop at this point, and let the user know their
                  * table is broken. */
                 if (h.length < 4)
                         break;