doc: correct orthography, word forms and missing/extraneous words

man/sd_bus_error.xml

@@ -200,7 +200,7 @@
     call can fail if no memory may be allocated for the name and
     message strings, in which case an
     <constant>SD_BUS_ERROR_NO_MEMORY</constant> error might be set
-    instead and -ENOMEM returned. Do not use this call on error
+    instead and -ENOMEM be returned. Do not use this call on error
     structures that are already initialized. If you intend to reuse an
     error structure, free the old data stored in it with
     <function>sd_bus_error_free()</function> first.</para>
@@ -238,7 +238,7 @@
     convenient usage in <function>return</function> statements. This
     call might fail due to lack of memory, in which case an
     <constant>SD_BUS_ERROR_NO_MEMORY</constant> error is set instead,
-    and -ENOMEM returned.</para>
+    and -ENOMEM is returned.</para>
 
     <para><function>sd_bus_error_set_errnof()</function> is similar to
     <function>sd_bus_error_set_errno()</function>, but in addition to
@@ -295,10 +295,10 @@
     <title>Return Value</title>
 
     <para>The functions <function>sd_bus_error_set()</function>,
-    <function>sd_bus_error_setf()</function>,
+    <function>sd_bus_error_setf()</function>, and
     <function>sd_bus_error_set_const()</function>, when successful,
     return the negative errno value corresponding to the
-    <parameter>name</parameter> parameter. Functions
+    <parameter>name</parameter> parameter. The functions
     <function>sd_bus_error_set_errno()</function>,
     <function>sd_bus_error_set_errnof()</function> and
     <function>sd_bus_error_set_errnofv()</function>, when successful,